better picture icon, fix https://github.com/owncloud/apps/issues/1401

ellipsize long modified dates to make room for showing delete button

remove needless element tag from the ocs share api

wrap stat() call in a try/catch block

Mark an app as loaded before we start loading it

Fixed image preview in trashbin subdirs

Slightly better looking file actions. 

- rename action is now checked inside of ".nametext" element
- added test to ensure that display() correctly resets all actions
  including the rename one

[issue/6263] layout.user.php code is not valid markup

Mobile style for public links: files, folders, picture sets

- for supported previews are shown with a size of 500px; icons with a size of 128px

Added error message for when target folder was removed

Add/fix Microsoft Office file icons.

Add white color variant of checkmark icon

Whent trying to upload/rename/create files in a folder that was removed
or rename, the correct error message is now shown.

In the case of upload of multiple files, the upload is cancelled.

This situation can happen if the target folder was renamed or removed
from another browser window or client.

[ocs share api] public upload is also possible with encryption enabled, since OC6

Fix warnings in logs when renaming over the web UI

The determineIcon() method was expecting attributes to be set which
caused warnings about undefined indices in the error log.

This fix pre-initializes the array with 'directory' and
'isPreviewAvailable' to make them disappear.

Sharing fixfiledownloadlink

[ocs share api] use error code 403 if sharing is not permitted

Remove unused $freeSpace