Refactor project from Ghost.App to Ghost.Editor

Changed the project structure to reflect a shift from `Ghost.App` to `Ghost.Editor`, updating namespaces and class names throughout.

Changed the application class in `App.xaml` and `App.xaml.cs` from `GhostApplication` to `EditorApplication`.

Changed several service interfaces to reside under `Ghost.Editor.Services.Contracts`, including `IInspectorService`, `INotificationService`, and `IProgressService`.

Added `InspectorView` and `InspectorViewModel` classes to manage inspector functionality.

Added `NavigationTabView` and `NavigationTabPage` classes to facilitate navigation within the editor.

Enhanced `WorldNode` and `EntityNode` classes to support scene graph functionality, including serialization and entity management.

Updated the project file `Ghost.Editor.csproj` to reflect the new structure and removed old references.

Modified the solution file `GhostEngine.sln` to remove references to `Ghost.App` and include `Ghost.Editor`.

Updated unit tests to align with the new namespaces and project structure.

Ghost.App/View/Pages/EngineEditor/InspectorPage.xaml

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<internal:NavigationTabPage
+    x:Class="Ghost.Editor.View.Pages.EngineEditor.InspectorPage"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:internal="using:Ghost.Editor.Controls.Internal"
+    xmlns:local="using:Ghost.Editor.View.Pages.EngineEditor"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d">
+
+    <Grid Background="{ThemeResource LayerFillColorDefaultBrush}">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="75" />
+            <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
+
+        <!--  Header  -->
+        <Grid
+            Grid.Row="0"
+            Padding="15,0,10,0"
+            Background="{ThemeResource CardBackgroundFillColorSecondaryBrush}"
+            BorderBrush="{ThemeResource CardStrokeColorDefaultSolid}"
+            BorderThickness="0,0,0,1">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="Auto" />
+                <ColumnDefinition Width="*" />
+            </Grid.ColumnDefinitions>
+            <IconSourceElement
+                Grid.Column="0"
+                Margin="0,0,15,0"
+                HorizontalAlignment="Left"
+                VerticalAlignment="Center"
+                IconSource="{x:Bind ViewModel.Inspectable.Icon, Mode=OneWay}" />
+            <ContentPresenter Grid.Column="1" Content="{x:Bind ViewModel.Inspectable.HeaderContent(), Mode=OneWay}" />
+        </Grid>
+
+        <!--  Content  -->
+        <Grid Grid.Row="1" Padding="10,0,10,0">
+            <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
+                <ContentPresenter Content="{x:Bind ViewModel.Inspectable.InspectorContent(), Mode=OneWay}" />
+            </ScrollViewer>
+        </Grid>
+    </Grid>
+</internal:NavigationTabPage>