updated to 2-7-0, loadouts tweaked

added:
- ACRE parameter
- tripwire action
minor fixes and more updateds towards 2-7-0
Loadouts tweaked
mission.sqm cleared up
minor updates and groupJoinAction added
updated mission conditions, updated gear scripts, updated mission.sqm
new spectator script
update to 2-7-0
Readme.MD updated
Royal Army -> British Army
small fix in ACRE loadout
typos fixed
more tweaks

- renamed BAF to BR
- renamed _res to _fr
- improved setGroupMarkers script (no more redundancy)
- tweaked ACRE loadout
minor fixes
typos fixed
Update to F2 2-7-1
gear script tweaks
updated ORBAT, update to 2-7-1
added _smg2 to US loadout
Update to F2-7-2