Fixed the level fade-out.

Fixed the level fade-out.
Reworked the shadow texture transform, fixing it for rotating bodies.
Conditioned out separate specular for ES.
Macroed glOrtho for ES compatibility.
Added glClientActiveTexture extension function.
Expanded a few glColorv functions.
Change glLightModeli to glLightModelf for ES compatibility.
Implemented a glClipPlane function compatible with both GL and ES.

git-svn-id: https://s.snth.net/svn/neverball/branches/gles@3559 78b8d119-cf0a-0410-b17c-f493084dd1d7