Allowing for Vsync to be disabled on DirectX desktop buils.
Fixed MaximumFrameLatency to be reset on ApplyChanges().
We now force the default MaximumFrameLatency when vsync is disabled.
Exposed PresentInterval on SwapChainRenderTarget so that VSync can be disabled if desired.
Removed the setting of MaximumFrameLatency from SwapChainRenderTarget, since this could override the setting from the GraphicsDevice.
Merge branch 'DirectX11VsyncDisable' of https://github.com/SickheadGames/MonoGame into DirectX11VsyncDisable
Added GetFrameLatency extension to PresentInterval.
GraphicsDevice now uses this extention.
Slightly clarified documentation.
Changed SwapChainRenderTarget to use new PresentInterval extention.
Merge pull request #1867 from SickheadGames/DirectX11VsyncDisable

Disable VSync on DirectX Desktop builds