Delete a few add-ons.

They are quite pointless. And not documented.
Remove a few add-ons that are documented but pointless/oboslete.
More descriptive name.
Remove more files to more pythonik names
More renaimng.
Merge branch 'feature-clean-up' into develop
Renaming and cleaning up.
The Anki 12 shortcuts.py wasn’t useless, just misnammed. Bringit back.