Allow maps to define custom initial cargo and fix initial notification.
Allow RenderRangeCircle on actors without armaments.
Move MuzzleFlash definition onto Armament.
Add upgrade rules.
Add AttackGarrisoned for allowing passengers to shoot outside. Fixes #4483.
Display fire ports in the combat debug overlay.
Don't render combat debug for units outside the world.
WIP: Port RA pillbox to new garrison system.
TEST: Add garrisonable jeep.
TEST: debug