Firebase Analytics -- Services

[Levi-Lesches]

We need an Analytics service that can log each type of event. I think it's useful to have each event separately instead of relying on a broad log(String event) function, but that's certainly up for debate. We should have the following functions:

• onAppOpen -- use built-in logAppOpen
• onLogin -- use built-in logLogin
• setUserGrade
• setBrightness (should record the brightness and log a custom event)
• onCreateReminder (includes edits)
• onDeleteReminder
• onUseScheduleDropdown
• onUseScheduleCalendar
• adminOnCreateSchedule (includes edits)
• adminOnEditCalendar

All these will be Future<void>, and because they are very specific, will take minimal parameters. All events should start with on and all admin-specific functionality should start with admin.