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.
Adds a simple injector that iterates over attrs of an input class and
injects things that look like custom weapons into pydcs's weapons
classes.
Also updated all current mod aircraft configs to perform the injection.
