Shake without effecting the real camera pos

The camera shake effect does not manipulate the real camera pos anymore, 
just the Opengl campos is effected by it. By this all camera pos related caches 
don't need to refresh just beause the camera shakes.
lua commands to shake the cam

-- camera-distance-affected=false
shakeCamera(int shakeIntensity, int shakeDuration) 

-- camera-distance-affected=true
shakeCameraOnUnit(int shakeIntensity, int shakeDuration , int UnitId)