Feature request: Check for overlapping vertex UV coordinates

[manavortex]

If two vertices share the same UV coordinate, Blender will split the geometry on export (as per the endless geometry generating octopus). This can lead to the following scenario:

• I export a mesh from Blender
• the mesh is under 65k verts, so the export check passes and I'm allowed to export
• the exporter gleefully generates vertices, which I will never notice
• Wolvenkit will now refuse to import the mesh

The AddOn could do two things here:

1. (maybe easy, maybe impossible): Check the exported glb file's geometry against the vertex limit
2. Check for vertices with overlapping UV coordinates and help the user to fix it