Some objects created by GraphicsDevice were not being disposed correctly:
 - GraphicsAdapter -> added call to GraphicsAdapter.Dispose() in GraphicsDevice.Dispose()
 - GraphicsOutput -> wrapped in ToDipose(output..)
- object output1 in GraphicsOutput's initialization code was not being disposed in DirectX11.1
Removed GraphicsAdapter.Dispose()
[Toolkit.Game] Added support for low priority rendering to normalize input latency for WPF platform
Update BoundingFrustum.cs

Added missing ref
Added MathUtil.Lerp
New formula for MathUtil.Lerp
removed commented code and improved comments formatting
Merge branch 'master' into master_integration