Change from QOpenGLWidget to QWindow

While QOpenGLWidget sounds like a good idea, it has issues which are
harder to debug due to how Qt manages the context behind the scenes. We
could probably work around any of these issues over time, but its
probably easier to do it ourselves with a QWindow directly.

Plus using QWindow + createWindowContainer is the easiest to use
configuration for Qt + Vulkan so this is probably much better in the
long run.

src/core/frontend/emu_window.h

@@ -31,7 +31,7 @@ public:
     /**
      * Recreate the presentation objects attached to this frame with the new specified width/height
      */
-    virtual void ReloadPresentFrame(Frontend::Frame* frame, u32 height, u32 width) = 0;
+    virtual void ReloadPresentFrame(Frontend::Frame* frame, u32 width, u32 height) = 0;
 
     /**
      * Render thread calls this to get an available frame to present