[SharpPak] Fix obfuscation attributes when merging assemblies
[Toolkit.Graphics] Fix issue #266. Switch to DirectWrite for tkfont and fix issue with offsets/measure when rendering.
[Samples] Fixed designer crashes for MiniCubeXaml/Win8.1 (github issue #274).
[SharpDX] Fixed compilation - internal ObfuscationAttribute not visible in SharpDX.XInput, SharpDX.Toolkit.Input and SharpDX.Toolkit.Yaml.
[Toolkit.Graphics] Improvement for issue #266. Make sure all glyphs will snap to the nearest pixel when rendering by rounding advance and line spacing to nearest. Add cleartype rendering (experimental).