Several wait listing related updates and ability to add registrant without creating an order
https://ten24.teamworkpm.net/tasks/1270947
https://ten24.teamworkpm.net/tasks/1293415
https://ten24.teamworkpm.net/tasks/1306376
https://ten24.teamworkpm.net/tasks/1306387
https://ten24.teamworkpm.net/tasks/1306399
Changed add event registration to modal