Separates ADD: behaviors from CHOOSE: behaviors.
Necessary to be able to convert the CHOOSE behaviors to a "Choose Driver" of sorts (i.e. Ability will not directly allow a Choose, you will need a CNAbility)

Issue#: CODE-2465


git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@23242 ef53c05b-3124-4d59-ae7d-fe3273f42be7