Interrupt GPU command processing when a frame's fence is reached. (#1741)

* Interrupt GPU command processing when a frame's fence is reached.

* Accumulate times rather than %s

* Accurate timer for vsync

Spin wait for the last .667ms of a frame. Avoids issues caused by signalling 16ms vsync. (periodic stutters in smo)

* Use event wait for better timing.

* Fix lazy wait

Windows doesn't seem to want to do 1ms consistently, so force a spin if we're less than 2ms.

* A bit more efficiency on frame waits.

Should now wait the remainder 0.6667 instead of 1.6667 sometimes (odd waits above 1ms are reliable, unlike 1ms waits)

* Better swap interval 0 solution

737 fps without breaking a sweat. Downside: Vsync can no longer be disabled on games that use the event heavily (link's awakening - which is ok since it breaks anyways)

* Fix comment.

* Address Comments.

Ryujinx.HLE/Switch.cs

@@ -177,6 +177,11 @@ namespace Ryujinx.HLE
             Gpu.GPFifo.DispatchCalls();
         }
 
+        public bool ConsumeFrameAvailable()
+        {
+            return Gpu.Window.ConsumeFrameAvailable();
+        }
+
         public void PresentFrame(Action swapBuffersCallback)
         {
             Gpu.Window.Present(swapBuffersCallback);