bilateral upscale option for SSAO
allow smaa to function without depth or stencil
ssao shader fixes
SSAO shader fixes
use R8 format for tqaa movemask to allow less reducing by default
use R8 format for SSAO where applicable
slightly different quincunx pattern
fix tqaa mask scaling
fix GL extension typo
fix double-rendering of explicit sky
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/Makefile