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.Engine/Services/Logger.cs

@@ -16,7 +16,7 @@ public static class Logger
     private const int _MAX_LOGS = 4096;
 
     private static readonly List<LogMessage> _logs = new();
-    internal static List<LogMessage> Logs => _logs;
+    internal static IReadOnlyList<LogMessage> Logs => _logs;
 
     internal static event Action<LogChangeType>? OnLogsUpdate;
 
@@ -39,7 +39,21 @@ public static class Logger
             stackTrace = new StackTrace(skipFrame, true);
         }
 
-        var logMessage = new LogMessage(level, message, stackTrace);
+        var logMessage = new LogMessage(level, message, stackTrace?.ToString());
+        _logs.Add(logMessage);
+
+        OnLogsUpdate?.Invoke(LogChangeType.LogAdded);
+    }
+
+    private static void LogExceptionInternal(Exception ex)
+    {
+        if (_logs.Count >= _MAX_LOGS)
+        {
+            _logs.RemoveAt(0);
+            OnLogsUpdate?.Invoke(LogChangeType.LogRemoved);
+        }
+
+        var logMessage = new LogMessage(LogLevel.Error, ex.Message, ex.StackTrace);
         _logs.Add(logMessage);
 
         OnLogsUpdate?.Invoke(LogChangeType.LogAdded);
@@ -65,6 +79,11 @@ public static class Logger
         LogInternal(LogLevel.Error, message, 3);
     }
 
+    public static void LogError(Exception ex)
+    {
+        LogExceptionInternal(ex);
+    }
+
     internal static void Clear()
     {
         _logs.Clear();