Release version 3.0.12

Improvements:
 - Reduce logging in final build.

Fixes:
 - Classes + School types + Teacher list was cached
   too strong. Added "change recognizer".

After reaching a new school year, it is required
to update teachers list, class and school types list.

This did not happend throughout automatically.
This update brings this feature to check
based on modification date/time and etags
whether data changes.

Release version 3.0.11

Fixes:
 - In certain situations on some android devices, the app crashed
   on start while reading credentials. Based on the information given
   it might interfer with the automatic backup to Google Drive.
   Prevent saving keystore.

Fixes:
 - In certain situations on some android devices, the app crashed
   on start while reading credentials. Based on the information given
   it might interfer with the automatic backup to Google Drive.
   Prevent saving keystore.

Release version 3.10

Improves:
 - Android app icon is now shown without white circle (improves splash as well)
 - Teacher settings contain a quick filter now

Fixes:
 - For each new push notification, log messages got one logger more, flooding the system log

Improves:
 - Android app icon is now shown without white circle

Fixes:
 - Log messages for push notifications got increased with each trigger
   Removed the duplicate configuration.
 - Push notification processing improved to ensure, things are not
   running in parallel.

Release version 3.0.9

Bugfix:
 - Scanner for login card does not always proper work
 - Upgrade unified push libraries (FCM fallback)
 - Fix black screen after login

Fix blackscreen during login

See merge request !2

Release version 3.0.7

Features:
 - Sort classes
 - Refresh UI on resume of the app