[Request] AI Fix on limited bow ranges

Just a simple request that if bow ranges are re-implemented that the AI won't keep try and firing the bow if they are out range thereby freezing the game.

This can be used to, as stated above, re-implement the bow ranges so that there is differentiation between a shortbow's range and a longbow.  This can then also be used when increasing the size of the tactical battlefield make certain bows more worthwhile than others.  This will help increase the tactical aspect of battle.