Game Engine UI: Image Sampling Texture Panel cleanup
removing non-GE supported features.

The idea of splitting the draw() function comes from Campbell Barton.
Review from him as well.

The main reason for not implement this in properties_games.py is to make sure the
panel is in the same order for both BI and BGE engines.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54008 954f8c5b-7b00-dc11-b283-0030488c597c