CameraComponent, ITargetNode

CameraConponent and rewritten cameras added. ITargetNode added to be
followed by the ThirdPersonCamera, and implemented in Car. A Debug
camera added. Scroll through cameras with the 'C'-key.
PreviousKeyboardState-component and service added, updates in
background.
Added Thumbs.db to gitignore
Fixed csproj
Merge remote-tracking branch 'origin/camera-component'

Conflicts:
	SampleCargame/SampleCargame/SampleCargame.csproj.Debug.cachefile
	datx02-rally/datx02-rally/Game1.cs
	datx02-rally/datx02-rally/datx02-rally.csproj.Debug.cachefile
Fixed solution efter merge.
Hejkomochhjälpgit
Merge branch 'master' of https://github.com/MintL/datx02-rally

Conflicts:
	datx02-rally/datx02-rally/Game1.cs