* Skip move avatar if avatars disabled

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

* bump version to ensure tables are created
* make updatenotification app use settings api
* change IAdmin::render() to getForm() and change return type from Template to TemplateResponse
* adjust User_LDAP accordingly, as well as built-in forms
* add IDateTimeFormatter to AppFramework/DependencyInjection/DIContainer.php. This is important so that \OC::$server->query() is able to resolve the
constructor parameters. We should ensure that all OCP/* stuff that is available from \OC::$server is available here. Kudos to @LukasReschke
* make sure apps that have settings info in their info.xml are loaded before triggering adding the settings setup method

Class Throttler implements the bruteforce protection for security actions in
Nextcloud.

It is working by logging invalid login attempts to the database and slowing
down all login attempts from the same subnet. The max delay is 30 seconds and
the starting delay are 200 milliseconds. (after the first failed login)

Probably nice for the people that contributed to 9.0 to see themselves in the AUTHORS file :)

* application/vnd.lotus-wordpro
* application/vnd.visio
* application/vnd.wordperfect
* application/msonenote

* Add extra db column to filecache
* Bump version
* Update filecache code to actually handle checksum
* Webdav code to store/retrieve checksums

mod_rewrite as used by the front controller may require a `RewriteBase` in case the installation is done using an alias. Since we cannot enforce a writable `.htaccess` file this will move the `front_controller_active` environment variable into the main .htaccess file. If administrators decide to have this one not writable they can still enable this feature by setting the `front_controller_active` environment variable within the Apache config.