Revert "make reshare settings foldable"

This reverts commit c01f196f.

Conflicts:
	settings/templates/admin.php

fix files multiselect bar now that the app list is gone

Remove legacy routing code

Don't update the mtime if the storage mtime hasn't changed

Fixed quota wrapper to return the value from flock()

Dont overwrite OCA.Sharing

table files_trashsizes was still used in some locations -> removed

The getfile routing code was absolutely legacy and not needed anymore. Additionally \OC::$REQUESTEDAPP was never set to the actually accessed application.

This commit removes the legacy routing code and ensures that $REQUESTEDAPP is always set so that other applications (e.g. the firewall or a two-factor authentication) can intercept the currently accessed app.

Testplan:
[x] Installation works
[x] Login with DB works
[x] Logout works
[x] Login with alternate backend works (tested with user_webdavauth)
[x] Other apps are accessible
[x] Redirect on login works (e.g. index.php?redirect_url=%2Fcore%2Findex.php%2Fsettings%2Fapps%3Finstalled)
[x] Personal settings are accessible
[x] Admin settings are accessible
[x] Sharing files works
[x] DAV works
[x] OC::$REQUESTEDAPP contains the requested application and can be intercepted by other applications

Use the permissions exposed by ownCloud for webdav external storages

use slide toggle for files app

Added switch to count external storage data in quota

Added Shared with link sidebar section in files app

remove file locking - code will continue to live in it's own app

Toggle app navigation not only on mobile, but on desktop as well

Fix mime type returning for shared with others files

Simulate apps database schema update on upgrade

Kill permissions table

- the file/folder's permission is now stored in the file cache
- BackGroundWatcher has been removed - this has meanwhile be replaced by occ files:scan which can be executed in a cron jobs
- increase version to trigger database migration

remove obsolete placeholder call, fix #8881

Update SabreDAV to 1.8.10

This prevents routes like "core/js/oc.js" to automatically load apps and
trigger their update prematurely.

minimal mail template editor for administrators

[versioning] let the file cache track the size of the versions