to work with new database sync

Vastly improved efficiency of event import from GraceDB by means of multiprocessing. Event import rate improved from ~0.2Hz to ~15Hz.

All Popups now dismiss when a new event is detected to prevent crashes when left on. Better buttons on History and DetStat screens.

New Welcome Screen with developer info space for later. Better-sized plots across the board. More color improvements.

Buzzer + LED full support for RPi. Code now runs on all platforms, with RPi auto-detected to enable GPIO features. Subtler color choices for Detector Statuses. Keys added to both detector status and Event History.

Future-proof event viewer now handles thousands of events, new LED support for detectors + stylistic changes

Event history now recovers previous events, displays important info and skymap for each. Nw skymap no longer generated for notices, downloaded from GraceDB instead