Managed DAVx⁵ for Enterprise

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https://tinyurl.com/353hchay

4.3.1.1 → 4.3.8:
* automatic sync over WorkManager (replaces AndroidSyncFramework)
* new VPN setting to better control "Internet" connectivity
* fix problem that caused battery drain
* fixed rare migration bug
* [CalDAV] better ignoring of local empty or blank values
* [CardDAV] improved group support with KIND values
* Certificate handling improved
* Timezone improvments
* and many more smaller fixes and improvements!