Simple Plugin system for Javascript
Log exceptions in DAV storage

In some cases a "NotFound" might be expected, so just return false as
before. But for other exceptions, the exception is now logged.
Remove obsoleted filelist prototype backup in tests
return correct result
Add filter for 'backend' to user REST route

This adds a "backend" type filter to the index REST route which is a pre-requisite for https://github.com/owncloud/core/issues/12620

For example when calling `index.php/settings/users/users?offset=0&limit=10&gid=&pattern=&backend=OC_User_Database` only users within the backend `OC_User_Database` would be shown. (requires sending a CSRF token as well)

Depends upon https://github.com/owncloud/core/pull/12711
Add login/logout to TestCase base class
Add user parameter to tag manager
Break loop
Use public interface
Allow extensions to specify the list of special parameters
Add test for getSpecialParameterList()
fix and compress files_external icon
show readonly message in file conflict dialog, make it always selected
Added searchByTags to view, storage and cache
Move file thumbnail into the label element
Replace input checkbox CSS selector with .electCheckBox
[tx-robot] updated from transifex
Merge pull request #12698 from owncloud/handle_readonly_shared_files

Handle readonly shared files
remove PHP generated user list and move all to the existing JS part
move loading of JS and CSS to template