[2.18] Look at using ace_common_fnc_addExplosionEventHandler for miscmedical/overpressure

[PabstMirror]

instead of using fragEH
should support any kind of explosive, not just frags
wait for 2.18 and fixes to locality

[lambdatiger]

I think this relies too heavily on ACE frag params to do this at the moment. As I've been writing the compats for the other Frag PR I've been keeping a lot of other unused items frag info in, so that may be more useful then, but currently it would just assume a mass of explosives that isn't accurate.