use Tr as translucency and use reflection coords for 'map_refl' setting.

code cleanup: python - pass multiple args to string startswith() / endswith() functions rather than calling multiple times.

This should fix [#31801] "OBJ importer doesn't import smoothing groups as sharp edges" reported by Tom Penn.

There was code to mark edges as sharp but it was disabled as being too slow. Found a quicker way using bmesh.
Reviewed by Campbell.

Now the importer assigns the object the same name as the object data.
Reviewed by Campbell.

This should fix [#31835] "OBJ Importer corrupts a model (crash in edit mode)" reported by paul geraskin.

The importer did the mesh validation before calculating edges (should be the other way around).
Reviewed by Campbell.

update addons enabled by default to use 'faces -> tessfaces' also grease pencil scatter and quake map export.

from Martijn Berger (juicyfruit) 

with some edits for efficient dict access.

indentation edits and copy pyrimid from contrib (where I had made some edits), removed so this wont happen again.

Fix #28816: Error when importing obj file with texture due to api change

Update obj importer and xcf importer to use new post-texface api.

- remove/comment unused variables
- remove unused imports
- fixed some bugs using incorrect variables

disable polygroup by default too.

Enable raytracing on OBJ materials always, not conforming to OBJ spec but this is annoying for newer software where raytracing is default.

also enable preset menu