This eliminates nearly all palette dependencies, most importantly font translation will now be done on True Color data, making translations on True Color font less destructive.
This was the result of an issue which stumped the entire Discord, which led to me having to debug from source to find why some relatively standard publicly available PBR materials work. GZDoom is the ONLY program in the typical development stack (GIMP, Slade, UDB) with this narrow of support for the PNG format. As such, the average developer will have no other way to figure out what's going wrong without these: these CANNOT be allowed to fail silently. As things like PNG-compression and 64-bit color become more common in royalty-free PBR materials, support should be an eventual target. Even then, these warnings should remain to prevent this from being an issue the next time things change.
* new texture format: ANM - this reads the first frame of a Build-ANM movie as a texture.
* some preparations for indexed (paletted) rendering.
* optimization of the patch texture checker - do not read in the entire file if checking the initial header is sufficient for rejecting it.
* handle brightmaps in the main shader instead of keeping separate instances around.
* added detail and glow layers from Raze.
* fixed material setup which could not guarantee that everything was initialized correctly.
* for warped textures, warp all layers. With this brightmaps finally work on warped textures.
Note: Vulkan reports a "device lost" error with this which still needs to be investigated.
