Generated Purchasable, RPGActor, Avatar, Companion

Beginning to convert ImageAdapter to PurchasableAdapter. Needed a
skeletal Companion to continue implementation. RPGActor shalll define
the algorithms for determining attributes given a StatStruct (or w/e you
want to call it) and other common methods shared among all participants
in the RPG battles (like name). Companion builds off Avatar and has
methods for determining stat allocation based on Avatar's StatStruct's
stat pool.