Polishing framework.

I found this strange - that linux framework project can be readed and compiled within VS but did not included by default to the solution. - And I includes it. Also I removes(but not actually delete) few useless(with 0 references) classes and structs from popular project types(winGL,winDX,win8,winphone,linux) which will reduce the redistributed size. Now, Input folder of all of these projects contains 16 files(exclude GamePad.cs), like XNA.

Excluded:
AccelerometerCapabilities.cs
AccelerometerState.cs
ButtonDefinition.cs
ThumbStickDefinition.cs

moreover - These classes/structs in these files is declared public and could distract and confuse users from XNA.