Make a stub lua AI

[sprunk]

Add a stub/example AI which would serve as a base for modders, since CAI is huge and scary as a starting point. The gadget would have just the basics:

• detect which teams are the StubAI.
• for each controlled team, make a mex and a fac; make 1 ravager repeat and send them on fight across the map. Just so people know how to keep track of units and give orders.
• perhaps spawn a chicken next to the commander to show that you can make chicken-defense style AIs and that you have control over gamestate?
• commented out entry in the ./LuaAI.lua list in root.