Fix white flash levelshot bug in OpenGL1

If you tried to draw the last loaded image, gl texture 0 (which is appearently white)
was used because renderer thought the image was already bound.

Why OpenGL1 renderer binds texture 0, I have no idea. It's been removed from OpenGL2.
r_noborder changes require a restart
Add latch to r_centerWindow and r_allowResize
Support spatialized raw streams in base sound, e.g. for VoIP
Merge remote-tracking branch 'ioquake3/master'

Conflicts:
	code/renderergl1/tr_init.c
	code/renderergl2/tr_init.c
	code/sdl/sdl_glimp.c