fix unconscious units dropping their fixed weapon.
add a few TFTD strings

these are just for the extra TU options on the battlescape.
add some hotkeys for the new reserve options
add TU reservation for kneeling, and expending all TUs.
All reaction fire is snapshot- so always reserve snapshot
dead and unconscious units can't think.
Merge branch 'master' of https://github.com/SupSuper/OpenXcom into Kmod

Conflicts:
	src/Battlescape/UnitDieBState.cpp