Add person reminder and rapid switching between people

[noahddewitt]

At the moment, to switch between crossers the workflow is open side pane --> settings --> person --> manual entry -- > ok --> return. With groups of 4+ crossers this can complicate switching, and we've found our most common error is forgetting to switch between crossers prior to reading in new crosses. We have also had some issues with uniformity between crosser names because re-entry is manual each time we switch people, even though it's the same group of about ~6 people making the crosses. Not sure if this is a bottleneck for other folks, but for our workflow it would be helpful to be able to input a specified sett of crossers somewhere in the settings, then have a form field on the main app view to switch between those pre-set crossers without having to go into the settings to change.

[trife]

@chaneylc this is something that should live in phenolib and be populated across all the apps where users are expected to input their name.