Cleanup with SL-19675 fix.  lifted empty check outside the workqueue post and cleaned up indentation

SL-19656 Rewrite avatar and attachment render metrics to not interfere with render pipe and be representative of actual render cost instead of driver synchronization time.

* SL-19656 Rewrite avatar and attachment render metrics to not interfere with render pipe and be representative of actual render cost instead of driver synchronization time.

* SL-19656 Remove now dead code (trackAttachments et al).

* SL-19656 Fix for crash on GL <= 3.2

SL-19644: Move GLTF transform reset out of pushBatch

DRTVWR-559 Touch up performance floater graphics preferences to remove preferences that no longer exist.

DRTVWR-559 merge 539

Has to use class1 now since class0 shouldn't ever be in use on
end-user systems anymore.

SL-19653: Fix some vertex buffer data mask asserts

DRTVWR-559 Add "No Post" mode and refactor "Scene Gamma" into "Brightness" for adjusting legacy gamma when probe ambiance is 0 and dynamic exposure when probe ambiance is not zero.

removing dead code and references to members that don't exist anymore

Temporarily moving new DRTVWR-559 LLDrawPool functions to someplace less likely to conflict with upcoming DRTVWR-539 merge

Add buffer visulization

SL-19560 Revert hacky fix for other avatars having low res BoM textures.  Fix for brightening of PBR materials at the shadow horizon.