added start and stop entries

enhanced administration of activities/projects/customers
added navbar for active records and recent activities
added edit timesheet entry form
added translation packages for errors and flashmessages
upgraded composer packages

src/TimesheetBundle/Resources/views/admin/activity.html.twig

@@ -6,8 +6,6 @@
 {% block page_subtitle %}{{ 'admin_activity.subtitle'|trans }} {{ 'subtitle.amount'|trans({'%count%': entries.count}) }}{% endblock %}
 
 {% block main %}
-    {{ include('default/_flash_messages.html.twig') }}
-
     {% if entries.count > 0 %}
         {{ tables.data_table_header({
             'label.id': 'hidden-xs',