Refactor authentication system (#2602)

Make auth configuration available via UI, remove FOSUserBundle and SAML-Bundle dependency

templates/base.html.twig

@@ -16,17 +16,12 @@
 
 {% block page_content_start %}
     {% if app.session and app.session.started and app.session.flashbag.peekAll|length > 0 %}
-        {% set close = adminlte_close_alert|default(true) %}
         {% set domain = 'flashmessages' %}
         <script type="text/javascript">
             document.addEventListener('kimai.initialized', function(options) {
                 var ALERT = options.detail.kimai.getPlugin('alert');
                 {% for type, messages in app.session.flashbag.all %}
                     {% for message in messages %}
-                        {% if type == 'fos_user_success' %}
-                            {% set type = 'success' %}
-                            {% set domain = 'FOSUserBundle' %}
-                        {% endif %}
                         {% if type == 'error' %}
                             ALERT.error('{{ message|trans({}, domain) }}');
                         {% elseif type == 'warning' %}