Add AI

[beforan]

Add the capability for AI controlled Doges.

At first just have the AI systematically hunt for items and route to the finish if it has them all.

Then beyond that, add combat, and then levels of difficulty.

Difficulty could be separated to a different issue later... but for now:

My original notes on difficulty behaviour:

• Easy: always tries to fight to the death in the same room, always picks a random furniture to check for items
• Medium: runs away when super low? checks all furniture in a room at a time but doesn't remember which rooms checked.
• Hard: runs away when losing fights, systematically checks and remembers furniture and re-checks old furniture after either player's death.