SL-19002: Handle edge case in client networking which could cause material ID and overrides to become out-of-sync

SL-19002: Stop sending material IDs from client via material params and just call queueApply/queueModify

SL-19080: GLTF Material asset consistency: Part 2: Update viewer GLTF Material asset upload to v1.1

SL-18762 Fix for broken local lights on alpha when wearing a HUD attachment.  Also fix stuck sun/moon and incidental decruft.

As it happens, the change in the LLUUID::combine() algorithm introduced by one
of my previous commits is causing invalid assets creation (seen with
some clothing items, such as Shape and Universal types); obviously, the server
is using the old algorithm for UUID validation purpose of these assets.

This commit reverts LLUUID::combine() code to use LLMD5.

SL-19080: Restrict LLGLTFMaterial fields test to a single compiler target, as results can vary between compilers

```
autobuild installables edit "tracy" url="https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/110561/960415/tracy-v0.7.8.578230-darwin64-578230.tar.bz2" hash="70f31fa71ecb52bd092da52e27c3ff8c"
autobuild installables edit "tracy" url="https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/110562/960424/tracy-v0.7.8.578230-windows-578230.tar.bz2" hash="1dc33422939adf015db85e96c5a8276e"
autobuild installables edit "tracy" url="https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/110563/960429/tracy-v0.7.8.578230-windows64-578230.tar.bz2" hash="fcc6ecece2ecb65aa36500dfa9461fb3"
```

We allow droping no-copy textures and materials into object's inventory, and we allow asigning them from picker, there should be no reason why drag &drop should be different

SL-19080: Update GLTF Material asset upload to v1.1, with stricter GLTF compliance and removal of unsupported features

SL-18780 Turn down contribution of cloud shadow to reflection probe ambiance and make the value a debug setting.

SL-19147 Water quality pass.  Remove gl_FragDepth writes from sky rendering (optimization).  Incidental decruft.

see commit e9e37aa2 for details.

SL-19148 Decruft followthrough -- fix for crash when running from installer.  Feed fresnel component into PBR alpha.  Remove obsolete "shader_hierarchy.txt", remove redundant LL_PROFILE_ZONE_SCOPED, remove unused shader feature flag.