Refactor project structure and improve performance

Changed the `ProjectRepository` class to be static for easier usage.
Changed `ProjectService` constants to public properties for accessibility.
Changed `App.xaml` to consolidate theme resources into `Override.xaml`.
Changed `App.xaml.cs` to implement an `AppStateMachine` for better state management.
Changed `ConsolePage` and `HierarchyPage` to utilize the new ViewModel structure.
Changed `ProjectPage` to use the `ExplorerItem` model for asset display.
Changed `Entity` and `EntityManager` to enhance component management with a new `IComponentData` interface.
Changed the `Logger` class to introduce structured logging functionality.
Changed the system architecture to support dependency management for better organization.
Changed the `QueryEnumerable` class to allow for more flexible entity queries.
Changed the `TypeHandle` class to improve efficiency in retrieving type handles.
Changed the `World` class to support robust world management and multiple worlds.
Updated the `Test` class to demonstrate the new entity and component management system.

Ghost.Editor/Helpers/Converters/AssetPathToGlyphConverter.cs

@@ -0,0 +1,40 @@
+using Microsoft.UI.Xaml.Data;
+using System;
+using System.IO;
+
+namespace Ghost.Editor.Helpers.Converters;
+
+public partial class AssetPathToGlyphConverter : IValueConverter
+{
+    public object? Convert(object value, Type targetType, object parameter, string language)
+    {
+        if (value is not string path)
+        {
+            return null;
+        }
+
+        if (Directory.Exists(path))
+        {
+            return "\uE8B7";
+        }
+
+        var extension = Path.GetExtension(path).ToLowerInvariant();
+
+        // TODO: Use resource dictionary for icons.
+        return extension switch
+        {
+            ".fbx" or ".obj" => "\uF158",
+            ".png" or ".jpg" or ".jpeg" or ".gif" or ".bmp" => "\uE91B", // Image icon
+            ".mp3" or ".wav" or ".ogg" => "\uE767", // Audio icon
+            ".mp4" or ".avi" or ".mkv" => "\uE714", // Video icon
+            ".txt" or ".md" => "\uF000", // Text file icon
+            ".cs" or ".hlsl" => "\uE943", // Code file icon
+            _ => "\uE8A5", // Default file icon
+        };
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        throw new NotImplementedException();
+    }
+}

Ghost.Editor/Helpers/HostHelpers.Page.cs

@@ -1,8 +1,11 @@
 using Ghost.Data.Services;
+using Ghost.Editor.View.Pages.EngineEditor;
 using Ghost.Editor.View.Pages.Landing;
 using Ghost.Editor.View.Windows;
-using Ghost.Editor.ViewModel.Pages.Landing;
-using Ghost.Editor.ViewModel.Windows;
+using Ghost.Editor.ViewModels.Pages.EngineEditor;
+using Ghost.Editor.ViewModels.Pages.Landing;
+using Ghost.Editor.ViewModels.Windows;
+using Ghost.Engine;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 
@@ -12,19 +15,31 @@ internal static partial class HostHelper
 {
     public static void AddLandingScope(HostBuilderContext context, IServiceCollection services)
     {
-        services.AddSingleton<LandingWindow>();
+        services.AddTransient<LandingWindow>();
 
         services.AddTransient<CreateProjectPage>();
         services.AddTransient<CreateProjectViewModel>();
 
         services.AddTransient<OpenProjectPage>();
+        services.AddTransient<OpenProjectViewModel>();
 
         services.AddTransient<ProjectService>();
     }
 
     public static void AddEngineScope(HostBuilderContext context, IServiceCollection services)
     {
-        services.AddSingleton<EngineEditorWindow>();
-        services.AddSingleton<EngineEditorViewModel>();
+        services.AddSingleton<EngineCore>();
+
+        services.AddTransient<EngineEditorWindow>();
+        services.AddTransient<EngineEditorViewModel>();
+
+        services.AddTransient<HierarchyPage>();
+        services.AddTransient<HierarchyViewModel>();
+
+        services.AddTransient<ProjectPage>();
+        services.AddTransient<ProjectViewModel>();
+
+        services.AddTransient<ConsolePage>();
+        services.AddTransient<ConsoleViewModel>();
     }
 }