Figure out and implement the RPG_RT auto battle algorithm.

Using it for the AutoBattle command is a bit controversial. Using it for an actor with AutoBattle flag set however is not. If a game dev created an actor with auto battle, the game experience probably demands that actor does more than just attack random enemies. There can also be some smarts from RPG_RT we can reuse event if we don't want to change the AutoBattle command to use skills.

I did some testing and one thing I saw. I had an actor with no skills set on autobattle. He would always attack the first enemy. This is better AI than attacking randomly, as at least he works on killing 1 at a time instead of randomly spreading the damage.

Also I noticed he would attack a different enemy only if his weapon would kill that enemy in a single hit. Adjusting the enemy HP would change which target he chose.

That's all I've got for now.