USASOC HELICOPTERS ACM MH6J

Makes the ACM MH-6J work with USASOC HELICOPTERS CORE.
- Flies as a Little Bird, with corrected AI flight settings.
- RTB / Hold / Overwatch orders at the nose.
- Armed variants use their GAU-19 and rocket pods for CAS.
Requires USASOC HELICOPTERS CORE and ACM MH-6J.
Fast rope is not supported yet on the Transport and Bench variants.