Refactor application structure and add unit tests

Added:
- New `ProgressService` class for managing progress indicators.
- New `AssetDatabase`, `AssetOpenHandlerAttribute`, and `AsyncAssetOpenHandlerAttribute` classes for asset handling.
- `Ghost.UnitTest` project for unit testing with associated files and configurations.

Changed:
- `ActivationHandler` class to ensure correct handling of `LaunchActivatedEventArgs`.
- `App.xaml.cs` to register `INotificationService` and `IProgressService`, replacing `StackedNotificationService`.
- `OnLaunched` method in `App.xaml.cs` to correctly call `ActivationHandler.Handle(args)` and start the host.
- `INavigationAware` interface from internal to public for broader access.
- `EditorState.cs` to activate `EditorApplication` with the current service provider.
- Property names in `AssetItem` and `ExplorerItem` structs to `Name` and `FullName`.
- `NotificationService` class to implement `INotificationService` and refactor notification handling.
- `AssetPathToGlyphConverter` to handle file extensions consistently.
- Bindings in `ProjectPage.xaml` and `ProjectPage.xaml.cs` to use `FullName` instead of `Path`.
- `EngineEditorWindow` and `LandingWindow` classes to utilize new notification and progress services.
- `Logger` class to include a new method for logging errors with exceptions.

Updated:
- Manifest files and project files to reflect new structure and dependencies.
- Solution file `GhostEngine.sln` to include the new unit test project.
- Added several new test classes and methods in `UnitTests.cs`.

Ghost.App/View/Windows/EngineEditorWindow.xaml

@@ -0,0 +1,244 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<winex:WindowEx
+    x:Class="Ghost.App.View.Windows.EngineEditorWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:behaviors="using:CommunityToolkit.WinUI.Behaviors"
+    xmlns:controls="using:CommunityToolkit.WinUI.Controls"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:ee="using:Ghost.App.View.Pages.EngineEditor"
+    xmlns:interactivity="using:Microsoft.Xaml.Interactivity"
+    xmlns:local="using:Ghost.App.View.Windows"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:winex="using:WinUIEx"
+    Activated="WindowEx_Activated"
+    Closed="WindowEx_Closed"
+    mc:Ignorable="d">
+
+    <Window.SystemBackdrop>
+        <MicaBackdrop />
+    </Window.SystemBackdrop>
+
+    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+            <RowDefinition Height="Auto" />
+        </Grid.RowDefinitions>
+
+        <!--  Titlebar  -->
+        <StackPanel
+            Grid.Row="0"
+            Padding="8"
+            Orientation="Horizontal">
+            <ImageIcon
+                Width="24"
+                Height="24"
+                VerticalAlignment="Center"
+                Source="ms-appx:///Assets/Icon.targetsize-32.png" />
+            <TextBlock
+                Margin="8,0,0,0"
+                VerticalAlignment="Center"
+                Style="{StaticResource CaptionTextBlockStyle}"
+                Text="{x:Bind ViewModel.engineVersionDescriptor}" />
+            <TextBlock
+                Margin="8,0,0,0"
+                VerticalAlignment="Center"
+                Style="{StaticResource CaptionTextBlockStyle}"
+                Text="{x:Bind ViewModel.CurrentProject.Metadata.Name, Mode=OneWay}" />
+        </StackPanel>
+
+        <!--  Toolbar  -->
+        <Grid Grid.Row="1" Margin="4,4">
+            <controls:TabbedCommandBar>
+                <controls:TabbedCommandBar.MenuItems>
+                    <controls:TabbedCommandBarItem Header="Home">
+                        <AppBarButton Label="Undo" />
+                        <AppBarButton Label="Redo" />
+                        <AppBarButton Label="Paste" />
+                    </controls:TabbedCommandBarItem>
+                    <controls:TabbedCommandBarItem Header="Home">
+                        <AppBarButton Label="Undo" />
+                        <AppBarButton Label="Redo" />
+                        <AppBarButton Label="Paste" />
+                    </controls:TabbedCommandBarItem>
+                    <controls:TabbedCommandBarItem Header="Home">
+                        <AppBarButton Label="Undo" />
+                        <AppBarButton Label="Redo" />
+                        <AppBarButton Label="Paste" />
+                    </controls:TabbedCommandBarItem>
+                </controls:TabbedCommandBar.MenuItems>
+            </controls:TabbedCommandBar>
+        </Grid>
+
+        <!--  Editor  -->
+        <Grid Grid.Row="2">
+            <Grid.RowDefinitions>
+                <RowDefinition Height="*" />
+                <RowDefinition Height="Auto" />
+            </Grid.RowDefinitions>
+
+            <Grid Grid.Row="0">
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="Auto" />
+                    <ColumnDefinition Width="*" />
+                    <ColumnDefinition Width="Auto" />
+                </Grid.ColumnDefinitions>
+
+                <TabView
+                    Grid.Column="0"
+                    Width="350"
+                    HorizontalAlignment="Stretch"
+                    VerticalAlignment="Stretch">
+                    <TabView.TabItems>
+                        <TabViewItem Header="Hierarchy">
+                            <TabViewItem.IconSource>
+                                <FontIconSource Glyph="&#xE8A4;" />
+                            </TabViewItem.IconSource>
+                            <ee:HierarchyPage />
+                        </TabViewItem>
+                    </TabView.TabItems>
+                </TabView>
+
+                <TabView Grid.Column="1">
+                    <TabView.TabItems>
+                        <TabViewItem Header="Scene">
+                            <TabViewItem.IconSource>
+                                <FontIconSource Glyph="&#xF159;" />
+                            </TabViewItem.IconSource>
+                            <Image
+                                VerticalAlignment="Center"
+                                Source="C:\Users\Misaki\OneDrive\Pictures\Screenshots\Screenshot 2024-07-20 021657.png"
+                                Stretch="UniformToFill" />
+                        </TabViewItem>
+                    </TabView.TabItems>
+                </TabView>
+
+                <Grid
+                    Grid.Column="2"
+                    Width="350"
+                    Background="Bisque" />
+            </Grid>
+
+            <TabView Grid.Row="1" Height="350">
+                <TabView.TabItems>
+                    <TabViewItem Header="Project">
+                        <TabViewItem.IconSource>
+                            <FontIconSource Glyph="&#xEC50;" />
+                        </TabViewItem.IconSource>
+                        <ee:ProjectPage />
+                    </TabViewItem>
+                    <TabViewItem Header="Console">
+                        <TabViewItem.IconSource>
+                            <FontIconSource Glyph="&#xE756;" />
+                        </TabViewItem.IconSource>
+                        <ee:ConsolePage />
+                    </TabViewItem>
+                </TabView.TabItems>
+            </TabView>
+        </Grid>
+
+        <!--  Status Bar  -->
+        <Grid
+            Grid.Row="3"
+            Height="25"
+            Background="{ThemeResource SolidBackgroundFillColorBaseAltBrush}">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="Auto" />
+                <ColumnDefinition Width="*" />
+                <ColumnDefinition Width="Auto" />
+            </Grid.ColumnDefinitions>
+
+            <Grid Grid.Column="0">
+                <FontIcon
+                    Margin="8,0,0,0"
+                    FontSize="16"
+                    Foreground="{ThemeResource SystemFillColorSuccessBrush}"
+                    Glyph="&#xE930;"
+                    Visibility="Visible" />
+
+                <StackPanel Orientation="Horizontal" Visibility="Collapsed">
+                    <FontIcon
+                        Margin="8,0,0,0"
+                        VerticalAlignment="Center"
+                        FontSize="16"
+                        Foreground="{ThemeResource SystemFillColorAttentionBrush}"
+                        Glyph="&#xE946;" />
+                    <TextBlock
+                        Margin="4,0,0,0"
+                        VerticalAlignment="Center"
+                        Style="{StaticResource CaptionTextBlockStyle}"
+                        Text="0" />
+                    <FontIcon
+                        Margin="8,0,0,0"
+                        VerticalAlignment="Center"
+                        FontSize="16"
+                        Foreground="{ThemeResource SystemFillColorCautionBrush}"
+                        Glyph="&#xE7BA;" />
+                    <TextBlock
+                        Margin="4,0,0,0"
+                        VerticalAlignment="Center"
+                        Style="{StaticResource CaptionTextBlockStyle}"
+                        Text="0" />
+                    <FontIcon
+                        Margin="8,0,0,0"
+                        VerticalAlignment="Center"
+                        FontSize="16"
+                        Foreground="{ThemeResource SystemFillColorCriticalBrush}"
+                        Glyph="&#xE783;" />
+                    <TextBlock
+                        Margin="4,0,0,0"
+                        VerticalAlignment="Center"
+                        Style="{StaticResource CaptionTextBlockStyle}"
+                        Text="0" />
+                </StackPanel>
+            </Grid>
+        </Grid>
+
+        <Grid Grid.Row="0" Grid.RowSpan="4">
+            <InfoBar
+                x:Name="InfoBar"
+                Margin="16"
+                HorizontalAlignment="Right"
+                VerticalAlignment="Bottom">
+                <interactivity:Interaction.Behaviors>
+                    <behaviors:StackedNotificationsBehavior x:Name="NotificationQueue" />
+                </interactivity:Interaction.Behaviors>
+            </InfoBar>
+
+            <Grid
+                x:Name="ProgressBarContainer"
+                Background="{ThemeResource SmokeFillColorDefaultBrush}"
+                Visibility="Collapsed">
+                <Grid
+                    Height="100"
+                    Padding="36,24"
+                    HorizontalAlignment="Center"
+                    VerticalAlignment="Center"
+                    Background="{ThemeResource SolidBackgroundFillColorBaseBrush}"
+                    CornerRadius="{StaticResource OverlayCornerRadius}">
+                    <Grid.RowDefinitions>
+                        <RowDefinition Height="*" />
+                        <RowDefinition Height="Auto" />
+                    </Grid.RowDefinitions>
+
+                    <TextBlock
+                        x:Name="ProgressMessage"
+                        Grid.Row="0"
+                        Margin="0,0,0,12"
+                        HorizontalAlignment="Center"
+                        VerticalAlignment="Center"
+                        Style="{StaticResource TitleTextBlockStyle}"
+                        Text="Loading..." />
+                    <ProgressBar
+                        x:Name="ProgressBar"
+                        Grid.Row="1"
+                        HorizontalAlignment="Stretch"
+                        VerticalAlignment="Center"
+                        IsIndeterminate="True" />
+                </Grid>
+            </Grid>
+        </Grid>
+    </Grid>
+</winex:WindowEx>