Combat, Behavior and Tweaks

These are the things demo'd in the meeting but havent been committed
yet:

Fixed up the prefabs. Walking through door pauses time and camera moves
faster. Added attack range and sight range to stats. Created Behavior
component and interface. implemented basic behavior for hero, mobs and
sidekick. Created basic combat component. Also created hitlist (priority
queue) that hero uses in behavoir to find his next target.