added annotation based exporter (#1831)

* added user exporter
* added project exporter
* added customer exporter
* added activity exporter

templates/project/actions.html.twig

@@ -3,6 +3,8 @@
     
     {% set actions = {'search': {'class': 'search-toggle visible-xs-inline'}, 'visibility': '#modal_project_admin'} %}
 
+    {% set actions = actions|merge({'download': {'url': path('project_export'), 'class': 'toolbar-action'}}) %}
+
     {% if is_granted('create_project') %}
         {% set actions = actions|merge({'create': path('admin_project_create')}) %}
     {% endif %}