Added weapons fallback data for the laser guided rockets, AIM-54's,
AGM-65 E/F, 4X Hellfire and TOW carried by US helis, rockets for them
to fall back to, all of the USSR IR missiles, R-3R, Mk-83 & Mk-84 and
adjusted the dates for the R-27ER &ET to 1990.
Both types use JSOW -> Walleye -> Mk 84. The JSOW A should maybe fall
back to some CBU instead, but I think the standoff capability is more
important to preserve than the warhead type.