Avalonia - Couple fixes and improvements to vulkan (#3483)

* drop split devices, rebase

* add fallback to opengl if vulkan is not available

* addressed review

* ensure present image references are incremented and decremented when necessary

* allow changing vsync for vulkan

* fix screenshot on avalonia vulkan

* save favorite when toggled

* improve sync between popups

* use separate devices for each new window

* fix crash when closing window

* addressed review

* don't create the main window with immediate mode

* change skia vk delegate to method

* update vulkan throwonerror

* addressed review

Ryujinx.Graphics.OpenGL/Window.cs

@@ -58,6 +58,8 @@ namespace Ryujinx.Graphics.OpenGL
             GL.PixelStore(PixelStoreParameter.UnpackAlignment, 4);
         }
 
+        public void ChangeVSyncMode(bool vsyncEnabled) { }
+
         private void CreateStagingFramebuffer()
         {
             _stagingFrameBuffer = GL.GenFramebuffer();