* fix XMLHttpRequest - send after callback is registered
* check for correct type of value - it's a boolean
* return correct content-type in status.php

This reverts commit 6a1a4880.

* files_encryption
* files_versions
* files_trashbin
* tests
* status.php
* core
* server container

Using status.php for this.
I modified status.php to also show, whether we're in maintenance.

Checks every 20 seconds if maintenance is over, if yes: reload.

Fixes https://github.com/owncloud/core/issues/8342

Added option to use the status.php with console.php via CLI

This is for all LowerCaseConstant warnings

respect coding style

Show the different editions to the user. Used in the status call, on the personal settings page and in the updater to update to the next available version from the same edition.

add status file. useful for external administration. show the ownClopud version at least in the config dialog.

Start of the refactoring. Commit is quite big because I forgot to use git right from the beginning. Sorry.