v.2.7.1

This version has been slightly reworked to bring the various visual components a little more up-to-date and easier to maintain.
Background images have been removed for ease of maintainability.
There's some new code for backing up and restoring databases but this may not work on Android 10 and earlier (this will be worked on as time permits).
At some point later this year (April?) BeeCount may be removed from the Play Store, but it will still be available here (signed with the same key as the Play Store version) and on F-Droid.