Combat - Player

It's now possible for the player to order their characters to attack
enemy characters by right-clicking on an enemy with a player party
member (or members) selected. The owner BaseObject of the enemy is sent
to PlayerPartyManager, which distributes it to all selected party
members.

The PlayerPartyManager now has an update() which updates one party
member per frame. This is used to run party members' limited AI
(contained in PlayerCtrldComp::update()), which controls thier actions
in combat (auto-attacking, moving towards the target, finding new
targets when the old one dies (if PlayerCtrldComp::_useAI = true)).