SH-1619 FIX
SH-1620 FIX
SH-2621 FIX

* Got lighting, shadows, and ambient occlusion working on ATI macs.
* Re-enabled ambient occlusion on ATI macs.
* Re-enabled depth of field on ATI macs.

Reviewed by Runitai Linden.

SH-1865 FIX -- removed some old non-deferred rendering code that was preventing anti-aliasing from working when GL_ARB_texture_multisample is unsupported

SH-1865 PROGRESS -- Disable the anti-aliasing control on hardware our code doesn't support for anti-aliasing

SH-2563 FIX -- Added diffuse map to the avatar rigid pass to properly set up the eyeball texture for Mac OS Lion

SH-2591 WIP -- fix for UI disappearing, introduces some artifacts in rotation ring, committing to debug elsewhere

SH-2240 Make alpha mask cutoff a little less aggressive (err on the side of not creating an alpha mask)

SH-2620 -- Enabled FXAA on OSX, which fixes the issue with latest code and some assorted shader cleanup from changeset e156c46db1b2

SH-24114 Remove unused vectorization code (outdated/unused with SSE2 requirement and llvetor4a et al)

SH-2652 Fix for black bands in high-res normal maps (break normal map generation up into tiles to handle the case where a normal map is higher resolution than the current window)

SH-2652 Slightly slower DoF (quality), apply FXAA *after* DoF, fix for some render targets not getting allocated when needed.