Sharing integration test 20645, added sabre dav and propfind check.

Fix column width of mtime column

[3rdparty] bump jeremeamia/superclosure to 2.1.0

Fix already defined warning from dav test bootstrap

Allow DI the system tag stuff without Application class

Activity oracle sql error for favorites

Update some JS dependencies

Fix the width of the share with input

Use XMLWriter to generate response

So evaluate the condition directly and return 1 or 0

Fix ext storage mount options dropdown

* the ID of this has changed to #shareWith-viewNUMBER and shouldn't
  be used in CSS
* now uses the proper classes

* in some translations (e.g. german) the header of this column otherwise
  got truncated
  "Zeitpunkt der Freigabe" vs "Zeitpunkt der Freig"

Gets rid of manual XML generation.

Implement systemtag managers and mapper

Fix public link getDownloadUrl to return Webdav public link

Update README.md

cache resized avatars

Use phpunit groups to run database code in isolation

Don't trust update server