Allows NPC's to use activatable objects by giving them special talents that serve as an interface for the AI.
Adds mod.class.interface.ActorObjectUse class (in mod.class.Actor)

When a usable object is added to an Actor inventory, the Actor may get a talent that can be activated to use the power.
This talent is similar to normal talents, but translates the object definition as needed for NPC use.
objects with a .use_power (most uniquely defined powers) are usable unless the .no_npc_use flag is set.
objects with a .use_simple field (mostly consumables) are not usable unless the .allow_npc_use flag is set or the .tactical field is defined.
objects with a .use_talent field (many charms and artifacts) are usable so long as the talent definition does not have the .no_npc_use flag set.
Energy use matches the object (based on standard action speed)
the new talent .on_pre_use function handles checking for object cooldowns, inventory access and a t.on_pre_use function (for talent-based powers)

Important fields defined within object.use_simple or object.use_power:
	.tactical = tactics table for interpretation by the tactical ai, subfields may be functions(who, t, aitarget) where who = object user, t = talent used (defined here), aitarget = who's (actor) target
	This should be defined for NPC's to use the object intelligently
	.on_pre_use = function(obj, who) that must return true for the object to be useable
	.range = range of the ability (defaults to 1, may be a function(self, t))
 	.radius = radius of ability (defaults to 0, may be a function(self, t))
	.target = targeting parameters (table, may be a function(self, t)), interpreted by engine.Target:getType
	.requires_target, if true, don't use the object if the target is beyond radius + range

Updated charms(amulet, belt, boots, cloak, light-armor, mindstars, ranged, staves, torques, totems, wands, weapons and some fixed arts) with the required fields to use the items.

engine:

updated ActorInventory functions to pass inventory and slot information as appropriate.

tactical AI

Updated the tactical AI and the talented_ai_tactic resolver to accept a function(self, t) for a talent tactical table.

Adds a charm resolver to randombosses and several NPC's (with tactical AI)

Equipping a useable item resets it's charges when it's equipped by any party member.
Updated the UseTalents dialog to use getTalentDisplayName for its list