Add DAVx5 support.

[RokeJulianLockhart]

Problem Statement

I don't want to have to duplicate account configuration across applications.

Possible Solution

Support consuming accounts added via https://github.com/bitfireAT/davx5-ose/blob/e6125dd6440d47239a577d0cab9a62f0a7dab952/README.md#davx.

Describe alternatives you've considered

What occurs currently - adding the accounts via each (this) application.

Additional context

https://github.com/bitfireAT/davx5-ose/releases/tag/v4.4.2-ose

[github-actions]

Thank you very much for opening up this issue! I am currently a bit overwhelmed by the many requests that arrive each week, so please forgive me, if I fail to respond personally. I am still very likely to at least skim read your request and I'll probably try to fix all (real) bugs if possible and I will likely review every single PR being made (please, give me a heads up if you intent to do so) and I will try to work on popular requests (please upvote via thumbs up on the original issue) whenever possible, but trying to respond to every single issue over the last years has been kind of draining and I need to adjust my approach for this project to remain fun for me and to make any progress with actually coding new stuff. Thanks for your understanding!

[github-actions]

This issue has not received any updates in 90 days. Please comment, if this still relevant!

[github-actions]

This issue has not received any updates in 90 days. Please comment, if this still relevant!

[sunjam]

Davx5 is the common open source Android app for using webdav, caldav and cardav.

[github-actions]

This issue has not received any updates in 90 days. Please comment, if this still relevant!

[culinia]

I would appreciate that feature very much, too

[johannesjo]

@everybody if you want to see this feature, you should ideally upvote the original issue. Thank you!