Added texture transform into the TEXCOORD branch and merged it into main

Not that hard, just read it, pass it to the rasterizer and then display it. I did have a very sneaky bug in the loader that made the whole feature render wrong, where I just had to negate one value to fully fix it, but now everything fully works.
Below you can see the Khronos test asset for texture transforms. (tick means fully working, clearcoat is not yet implemented so it doesn’t show as working)