feat(events,internal) Expanded waiting list feature, RSVPs.

Details:
1) If the 'Require Phone' option is selected for an event, people joining the waiting list are asked for it too.
2) The people in the waiting list for each event can be seen in the Even Statis$
3) Allows staff to remove people from the waiting list
4) Allow staff to remove people from the RSVP
5) Fix small bug when viewing RSVP lists
6) When users are moved from thevwaiting list to the RSVP, they are sent an email notification