Allow pathname in SET-CONTRIB-DIR

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>
Cleanup in module.lisp

- add earmuffs to contrib-dir
- cosmetics

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>
Added earmuffs to contrib-dir
Merge branch 'db/cleanup-module.lisp' of https://github.com/exot/stumpwm into exot-db/cleanup-module.lisp

Conflicts:
	module.lisp