DayBack Beta: Speed Boost

This change allows DayBack to asynchronously fetch all group settings at once and cache those settings locally in the browser using indexDB. This will make the speed at which DayBack loads more consistent, and testing shows up to a 200% speedup in loading group settings. DayBack now caches access tokens on the server to speed up reloads and navigation back to DayBack. Users will see this speed when they first open DayBack and when they arrive back at the calendar from other Salesforce pages or FileMaker layouts.