Contacts & Calendars on iCloud

Sep 1, 2021

https://forums.bitfire.at/topic/2572/davx-3-4-release-notes
* CardDAV: better support for contact dates (birthday, anniversary, custom dates with label), relations and other properties
* explicit Android 12 compatbility (WiFi SSID restriction requires "precise" location permission)
* sync: use global thread pool for sync threads for better performance/stability
* attach non-verbose logs to debug info by default
* many internal improvements and small bug fixes