Version 3.1

* reworked permissions: permissions are now clearly managed application-wide (no unclear notifications about missing permissions anymore)
* minify VTIMEZONEs (doesn’t include observances for times before DTSTART anymore) of sent events/tasks
* sync algorithm: reworking with improvements in parallelism, cancelling, exception handling (using parallel coroutines)
* account creation/login: suggest all detected email addresses as account name
* internal rewrite: now uses latest ical4j/3.x even on Android 5+ with R8 desugaring
* minor improvements and bug fixes
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