Simplify texture bindings by removing single UDIM texture

[theblackunknown]

In this scene, there are many bounds textures which use a <UDIM> placeholder, however there are very often a single texture bound.
In the spirit of making this asset simpler and more accessible we should replace those with simple texture without the placeholder.

It is a trivial change for all the 1001 ones.
However removing the other ones requires mesh modification to adapt the texture coordinates to the simple scheme.
Care should also be taken if a mesh is splitted un GeomSubSet where it is not straightforward to modify texture coordinates without breaking other bound looks.