Imported PSKs will now have the first UV layer named UVMap instead of VTXW0000

This is because it caused issues for some folks when joining meshes made
in Blender and meshes imported from a PSK. There would be two UV maps,
and if the user wanted to make them share the same UVMap, they would
need to go out of their way to fix the naming of the UV layers to match.

io_scene_psk_psa/psk/importer.py

@@ -171,7 +171,7 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
 
         # TEXTURE COORDINATES
         uv_layer_data_index = 0
-        uv_layer = mesh_data.uv_layers.new(name='VTXW0000')
+        uv_layer = mesh_data.uv_layers.new(name='UVMap')
         for face_index, face in enumerate(psk.faces):
             if face_index in invalid_face_indices:
                 continue