pydcs_extensions.__init__ wasn't actually doing anything because without
an __init__.py each of these "packages" was empty. This has been working
by accident because of ai_flight_planner_db.py.
Includes the new A-10C radios. Will follow up to make Liberation
actually use them.
This manually removes some weapons from mod files that were removed from
DCS. Those mods may need re-exporting, and may also need updating by
their authors, but for now this should keep them functioning.
