Movement Update

Fixed various issues with the AIs.

(1). AI's will now immediately run away from a fist after recovering
from a fall if the fist is close enough.

(2). AI's now continue moving after falling instead of hesitating for
multiple seconds. Now will move again within 2 seconds.

(3) AI's move towards apples within their view range. View is calculated
like this.

(Base view range (20)) + (indiv. happiness * 2)

Individual happiness is the happiness level of a particular AI. Not the
overall.