[FNA #147] - Initial work on style for Input. AccelerometerCapabilities.cs to GamePadDPad.cs should be mostly done. Others are partially done.
Merge branch 'monogame-sdl2' of https://github.com/flibitijibibo/MonoGame into monogame-sdl2
[FNA #147] The rest of the style cleanup for Input.
[FNA #147] Input style cleanup fixes.
Merge pull request #183 from khbecker/monogame-sdl2

[FNA] Style Cleanup for Input