Stealth and Searching Work

As the title says, stealth and searching now work, both for the player and NPCs.

GearHead Caramel uses a Dungeon Monkey-style invocations system for all attacks and skill uses. One of the great things about this system is that skills contain their own usage instructions; instead of the NPC AI needing to know about every possible skill, it can just query the NPC’s skill list to ask each one how useful it would be right now. Based on the usefulness values returned, a skill is chosen and invoked.