Refactor and enhance resource management and rendering

Updated multiple components to improve encapsulation, maintainability, and performance. Key changes include:

- Upgraded package dependencies in project files.
- Refactored `Mesh` and `RenderingContext` to use properties and added support for per-object constant buffers.
- Improved resource management in `D3D12CommandBuffer`, `D3D12CommandQueue`, and `D3D12ResourceAllocator` with better encapsulation and disposal handling.
- Added validation for constant buffer sizes in `D3D12PipelineLibrary`.
- Simplified `MeshBuilder` methods to accept allocators and removed hardcoded values.
- Enhanced debugging with `GPUResourceLeakException` and resource tracking updates.
- Updated shaders and rendering logic for testing, including hardcoded triangle rendering.
- Removed redundant base classes and interfaces for cleaner code structure.

Ghost.Graphics/RenderSystem.cs

@@ -172,11 +172,7 @@ internal class RenderSystem : IRenderSystem
 
         _isRunning = false;
         _shutdownEvent.Set();
-
-        if (_renderThread.IsAlive)
-        {
-            _renderThread.Join();
-        }
+        _renderThread.Join();
     }
 
     public bool WaitForGPUReady(int timeOut = -1)
@@ -242,7 +238,10 @@ internal class RenderSystem : IRenderSystem
             frameResource.Dispose();
         }
 
+        _graphicsEngine.Dispose();
         _shutdownEvent.Dispose();
+
         _disposed = true;
+        GC.SuppressFinalize(this);
     }
 }