Add more War Mace models to Mace Mastery

[ThatGuyCDude]

Being able to pick a shovel, a baseball bat, a sledge hammer, a pipe wrench, a mallet, or a nightstick for the Mace Mastery mace would open a lot of costume concepts late game... it'd almost be worth picking an otherwise throwaway power in a build just to put one on the character's back.

Right now the only maces available to Arachnos Soldiers and Mace Mastery characters are very magical or high-tech in design.  Granted, the grenade-launching component breaks the illusion if you're shooting it out of a sledgehammer, but leave that to us to come up with an explanation for it.