Refactor activation handling and introduce entity system

Added new `ActivationHandler` class for folder initialization.
Added `ProjectService` class for project-related operations.
Added `Ghost.Entities` project with entity management classes.
Added `EngineEditorWindow` for enhanced user interface.

Changed project files to restructure dependencies and remove unused references.
Changed `ProjectRepository` to use asynchronous methods for improved performance.
Changed data binding in `CreateProjectPage.xaml` and `OpenProjectPage.xaml` to use new data models.
Changed `App.xaml.cs` to utilize the new `ActivationHandler` and include additional services.

Removed `IActivationHandler` interface and integrated its functionality into `ActivationHandler`.
Removed `EditorActivationHandler` as its functionality was merged into `ActivationHandler`.

Updated `AssemblyInfo.cs` to include global using directives for entity types.
Updated image assets to reflect visual resource changes.

Ghost.Editor/Models/Warpers/TemplateInfoWarper.cs

@@ -1,25 +0,0 @@
-using Ghost.Database.Models.Projects;
-using System;
-using System.IO;
-
-namespace Ghost.Editor.Models.Warpers;
-
-internal class TemplateInfoWarper(string templatePath, TemplateInfo info)
-{
-    private const string _ICON_NAME = "icon.png";
-    private const string _PREVIEW_NAME = "preview.png";
-
-    public string directory = Path.GetDirectoryName(templatePath)!;
-
-    public TemplateInfo Info => info;
-
-    public Uri GetIconURI()
-    {
-        return new Uri(Path.Combine(directory, _ICON_NAME));
-    }
-
-    public Uri GetPreviewURI()
-    {
-        return new Uri(Path.Combine(directory, _PREVIEW_NAME));
-    }
-}