Explosive Penetration Fix

Fixes explosives being able to penetrate things they shouldn't.
Significantly reduces the magic 3 units of explosive damage most base warheads have, to 0.5 units.
Adds functional and believable penetration to the affected explosives

Items affected:
Vanilla:
Grenade base
HEAT base
HEAT M72A3
HEAT PG7VM
HE M406
HE VOG 25
HEDP M433
Grenade M67
Grenade RGD5

RHS:
Thermobaric VGM93.100
FRAG OG7V
Plus all warheads in RHS that inherit from vanilla bases