Fix uninitialized values and release COM resources after use

Source/Engine/GraphicsDevice/DirectX/DX11/GPUDeviceDX11.cpp

@@ -275,6 +275,7 @@ bool GPUDeviceDX11::Init()
             {
                 AllowTearing = true;
             }
+            factory5->Release();
         }
     }
 

Source/Engine/GraphicsDevice/DirectX/DX12/GPUDeviceDX12.cpp

@@ -274,6 +274,7 @@ bool GPUDeviceDX12::Init()
             {
                 AllowTearing = true;
             }
+            factory5->Release();
         }
     }
 

Source/Engine/GraphicsDevice/DirectX/DX12/GPUSwapChainDX12.cpp

@@ -51,6 +51,8 @@ GPUSwapChainDX12::GPUSwapChainDX12(GPUDeviceDX12* device, Window* window)
     , _windowHandle(static_cast<HWND>(window->GetNativePtr()))
     , _swapChain(nullptr)
     , _currentFrameIndex(0)
+    , _allowTearing(false)
+    , _isFullscreen(false)
 {
     ASSERT(_windowHandle);
     _window = window;