Made it so a clacker is required on the player in order to expose it as a trigger option. As well as removing the ability for a player without a clacker to gain clacker explosives.
Made it so PlaceExplosive could be called from script (removed the dependency on it being called from actual player who plants it), allows for mission editors to make use of it.
Merge pull request #618 from CorruptedHeart/ExplosiveTrigger

Explosive trigger