Added SystemTagManager and SystemTagObjectMapper

Bump 3rdparty. No longer ship 3rdparty tests dirs

Bump 3rdparty for icewind/streams-0.3.0

Adjust the method name to reflect it's behaviour

Remove "Text file" entry in the "+" menu

Add carddav sharing

Make the JobList test more robust by sorting the result of getAll bef…

Core interfaces for system tags and its manager

The text editor app will register this instead.

Also made "fileList" a non-private attribute to make it possible for
plugins to access the attached file list object.

Addressbook sharing added based on a simplified approach which is based on calendar sharing standard

Integration fix docs

Add internal locking plugin

clarify log level setting design, fix #20514

Use proper variable

`$shares` is not defined. Introduced with https://github.com/owncloud/core/commit/c3e7d324c5e61eb087fb2ea5102d332f9f08db3d and thus also in stable8.2

Fix getOwner for external shares

Update .well-known redirects to the new dav endpoint

This reverts commit 68321efd.

This reverts commit d831c255.

Introducing CalDAV into core

Add internal fileid to webdav response

Handle errors on memcached level