Fix Glow

[AzureAaron]

Makes the glowing effect not apply through walls when custom glow is applied.

• Fixes mobs rendering as a solid colour when they have a custom glow applied and no mob had a vanilla glow applied
• Fixes numerous edge cases where the old system had false positives

[viciscat]

bit of a shame it breaks rendering for other mobs, would it be possible to change the mixin to be per mob? like save the previous buffer and restore it after, although idk if that's expensive

[AzureAaron]

bit of a shame it breaks rendering for other mobs, would it be possible to change the mixin to be per mob? like save the previous buffer and restore it after, although idk if that's expensive

I'm not sure if framebuffers can work this way, the other "easier" solution (theoretically) would be to have two frame buffers but it's complex as everything would need to be adjusted. I think this is fine as is, people don't care too much about seeing their teammates through walls and outside of dungeons glowing isn't used at all (except for dropped items but those aren't too important).