Revert "Display accelerators in menu, let's hope this works,"

This reverts commit 10f0eb1814ac97f75584148c6fe6562612daf201.
Don't refresh shaders in another thread...
Fix MediaBrowser previews going grey without selection, again.

Since I wasn't able to figure out which state exactly got leaked in the
regular render pass, I added glPushAttrib/glPopAttrib pair to the entire
render() method.