Unify three types of non-FIFO requests to the GPU thread around Common::Event and Common::Flag.

The only possible functionality change is that s_efbAccessRequested and
s_swapRequested are no longer reset at init and shutdown of the OGL
backend (only; this is the only interaction any files other than
MainBase.cpp have with them).  I am fairly certain this was entirely
vestigial.

Possible performance implications: efbAccessReady now uses an Event
rather than spinning, which might be slightly slower, but considering
the slow loop the flags are being checked in from the GPU thread, I
doubt it's noticeable.

Also, this uses sequentially consistent rather than release/acquire
memory order, which might be slightly slower, especially on ARM...
something to improve in Event/Flag, really.

Source/Core/VideoCommon/RenderBase.cpp

@@ -126,7 +126,7 @@ void Renderer::RenderToXFB(u32 xfbAddr, const EFBRectangle& sourceRc, u32 fbWidt
 	else
 	{
 		Swap(xfbAddr, fbWidth, fbHeight,sourceRc,Gamma);
-		Common::AtomicStoreRelease(s_swapRequested, false);
+		s_swapRequested.Clear();
 	}
 }