[Happiness (is a) Warm Gun] Skeletons should be able to equip and use guns and grenades

[Chribit]

"Happiness (is a) Warm Gun" adds various real world and fantasy firearms, explosives and other throwables to minecraft. While skeletons can equip the weapons, they can't use them properly (and just hit enemies with them).

I'd like skeletons to be able to use firearms just like they use other ranged weapons. They should equip ammunition (of the right type) in their off-hand and reload when necessary. Grenades should be thrown if necessary (however, I do think that should be a configurable option due to block destruction).