Ability to script creature movements

[crankycyclops]

This wouldn't work with the current event handling scheme, which must exit as soon as possible so that events in the game can continue. We should be able to script the actions of a creature in the game, so that they can function as NPCs. Maybe create a new Creature type, NPC? Except that I want to be able to script all characters. I'll have to investigate this further.

[crankycyclops]

I could couple this to wanderlust. There could be different motion-generators for it (by default, it's just random), or I could also offer the option of using a lua script to determine how the creature's movements are generated.