Investigate better way to input users

[pkoenig10]

Currently participants are entered into forms by entering either an Andrew ID, card swipe number, or card NFC number and then pressing enter or changing focus. A search request is then made for that user and they are looked up in the DB. This difference between the model attribute value and the values entered into form fields, make user entry tricky. It would nice to have a smoother workflow for entering users that allowed for fields to display nicely, specifically when a previous object is edited. See #202 and #239 for more context.