adding persona grabbing to user board syncing. makes it so new personas that show up on a sync will be accounted for in app
board invite system now takes :invite-id for accept-board-invite/leave-board-share. this allows you to (on top of a persona) specify the id of the privs entry you wish to replace. it essentially allows a validated persona to replace an email invite. also adding accept-invite/deny-invite functions to invite system, and fixing some general invite bugs. all working great now!!