Refactor project management and enhance architecture

Added a new static class `AssetsPath` for asset management.
Added a new icon file (`icon-256.ico`) for UI representation.
Added new package references to enhance functionality.
Added internals visibility attributes for better testing.
Added a new `EngineEditorViewModel` class for MVVM support.
Added a new `GameObject` class for component management.
Added a new `BitSet` class for efficient bit manipulation.
Added various utility classes to support the new entity system.

Changed the `ID` property in `ProjectInfo` to internal.
Changed the `AddProjectAsync` method to return the created `ProjectInfo`.
Changed the connection string retrieval method to use the new `Command` constant.
Changed the `DataPath` class to use `readonly` fields for folder paths.
Changed the `ActivationHandler` class to use new `DataPath` constants.
Changed the `OpenProjectPage` layout and interaction for better UI.

Updated the target framework to a newer version for compatibility.
Updated the `ProjectService` to use new constants from `DataPath`.
Updated the `World` class to improve entity management.

Refactored the `ProjectRepository` class to encapsulate SQL commands.
Refactored the `Transform` class to use properties for better encapsulation.

Ghost.Editor/View/Windows/LandingWindow.xaml

@@ -7,7 +7,6 @@
     xmlns:local="using:Ghost.Editor.View.Windows"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:winex="using:WinUIEx"
-    Title="Landing"
     IsResizable="False"
     mc:Ignorable="d">
 
@@ -15,7 +14,7 @@
         <MicaBackdrop />
     </Window.SystemBackdrop>
 
-    <Grid>
+    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
         <Grid.RowDefinitions>
             <RowDefinition Height="32" />
             <RowDefinition Height="*" />
@@ -55,6 +54,8 @@
                 x:Name="ContentFrame"
                 Grid.Row="1"
                 Padding="8"
+                CacheMode="BitmapCache"
+                CacheSize="10"
                 IsNavigationStackEnabled="False" />
         </Grid>
     </Grid>