Merge xcode-14.3 compatibility branch into DRTVWR-559

SL-20018: Fix PBR glow affected by Blinn-Phong alpha

following promotion of DRTVWR-580

found this warning found while working on SL-19999

SL-19567: Mitigate glow banding

SL-19567: (WIP) Add options to use higher precision for glow and post-process buffers. Disabled by default.

SL-19992: Fix LOD assert

SL-19992: Fix assert in LLVolumeLODGroup::refLOD when LLMeshRepository::notifyMeshUnavailable is called on the highest LOD

A New Material created in Inventory should be immediately usable.

SL-19966 Reverted "SL-18721: Faster viewer shutdown time since performance improvements can lead to perceived inventory loss due to cache corruption"

This reverts commit cf692c40.

SL-17405 (Part 2): Fix viewer not requesting land impact when a non-root prim in a link set gets a GLTF material ID update

SL-17405 (Part 2): Fix viewer not requesting land impact when a non-root prim in a link set gets a GLTF material ID update

DRTVWR-559 Fix for manual probes not updating as often as they should when nearby (bad distance calculation)