Add a "party" code framework, allowing you to have multiple creatures in a...

Add a "party" code framework, allowing you to have multiple creatures in a party and assume direct control of one of them (and switch at will)
Summon Control is now a passive that allows summons to be part of the party, increases dureation and reduces damage taken
Default keybinds: F1-F8 for quick select of party members; ctrl+tab for popup
Clicking on the creature "portrait" in the left side pane will transfer control


git-svn-id: http://svn.net-core.org/repos/t-engine4@2276 51575b47-30f0-44d4-a5cc-537603b46e54