Added more API documentation to TouchPanel.cs.
Added more API documentation to TouchPanelCapabilities.cs.
Added more API documentation to TouchCollection.cs, TouchLocationState.cs, GestureType.cs, MonoGame.Framework/Input/Touch/TouchLocationState.cs.
Merge pull request #1285 from raistlinthewiz/develop3d

Added API documentation for Mouse.cs and MouseState.cs.
Merge pull request #1287 from raistlinthewiz/touch-panel-docs

Added API documentation for Input.Touch classes.