Refactor project structure and enhance functionality

Added `InternalsVisibleTo` attribute for "Ghost.Editor" in `AssemblyInfo.cs`.
Added a binary file `Empty.zip` to the project.
Added a new `ProjectMetadata` class in `ProjectMetadata.cs`.
Added new states and interfaces for managing application states in `EditorState.cs`, `LandingState.cs`, and `IAppState.cs`.
Added a notification service in `INotificationService.cs` and `StackedNotificationService.cs`.
Added new XAML files for UI components, including `InspectorView.xaml` and `InternalControls.xaml`.

Changed the `ProjectInfo` class in `ProjectInfo.cs` to include a `MetadataPath` property instead of `Path` and `EngineVersion`.
Changed the `TemplateInfo` class in `TemplateInfo.cs` to use a struct instead of a class for `TemplateData`.
Changed the `ProjectService` class to use the new `ProjectRepository` for managing project data.

Removed several using directives and the entire `ProjectRepository` class from `ProjectRepository.cs`, replacing it with a new implementation.
Removed old methods and properties in `EntityManager` and `World` classes to improve entity management and component handling.

Updated the `Ghost.Data.csproj` file to include the new `Empty.zip` file as a content item.
Updated the `ProjectRepository` class to manage project data using SQLite.
Updated various XAML files to include new styles and controls, improving the overall UI design.
Updated the `CreateProjectViewModel` to include a notification service and handle project creation logic.
Updated the test project to include references to the new `Ghost.Graphics` project and modified test cases to align with the new structure.

Ghost.Editor/View/Windows/LandingWindow.xaml

@@ -3,10 +3,14 @@
     x:Class="Ghost.Editor.View.Windows.LandingWindow"
     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:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:interactivity="using:Microsoft.Xaml.Interactivity"
     xmlns:local="using:Ghost.Editor.View.Windows"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:winex="using:WinUIEx"
+    Activated="WindowEx_Activated"
+    Closed="WindowEx_Closed"
     IsResizable="False"
     mc:Ignorable="d">
 
@@ -55,8 +59,19 @@
                 Grid.Row="1"
                 Padding="8"
                 CacheMode="BitmapCache"
-                CacheSize="10"
-                IsNavigationStackEnabled="False" />
+                CacheSize="10" />
+        </Grid>
+
+        <Grid Grid.Row="1" Padding="16">
+            <InfoBar
+                x:Name="InfoBar"
+                HorizontalAlignment="Right"
+                VerticalAlignment="Bottom">
+                <interactivity:Interaction.Behaviors>
+                    <behaviors:StackedNotificationsBehavior x:Name="NotificationQueue" />
+                </interactivity:Interaction.Behaviors>
+            </InfoBar>
+
         </Grid>
     </Grid>
 </winex:WindowEx>