Blender Git Loki

Fix [#36759] UV Project - Specified UV Map doesnt work properly

In fact, the issue was that names of mloopuv/mtespoly layers could very easily get out of sync (a simple rename was enough), while most tools (such as the UVProject modifier) expect matching layers to have the same name!

Now matching names are check on load, and renaming of a layer through RNA is guaranted to be synchronized with its counterparts.

Thanks to Brecht & Campbell for reviews.