Adding system addressbook for users of this instance - a occ command …

Reduce OC_Config usage in lib/

* replaced by proper public interfaces

Remove OC_Config from app management template

* add unit test for this case

remove old propagation logic

Execute only for web and not for CLI

Ensure trailing slash in URIs

Respect disabled incoming federated shares

Check if rewrite base is set if rewrite is active

Add quota behat test

Add metadata to post delete hooks

Allow DI for OCP\Files\IMimeTypeDetector

Check the expiration date for null

Proposal: add enumeration function to IUserManager which simply calls a callbask for each user in all backends

Adding a second principal backend which holds system principals - as of now only one principals/system/system

Only fetch the incoming federated shares if incoming shares are actually
enabled.

Fixes #20713

DI in avatar code

* DI in avatar code
* Use the node API
* More unit tests
* Unit tests no longer require DB