more extension points for plugins (#1904)

templates/user/actions.html.twig

@@ -53,7 +53,7 @@
     {{ widgets.page_actions(event.payload.actions) }}
 {% endmacro %}
 
-{% macro user(user, view) %}
+{% macro user(user, view, options) %}
     {% import "macros/widgets.html.twig" as widgets %}
     {% set actions = {} %}
 
@@ -84,6 +84,10 @@
         {% endif %}
     {% endif %}
 
+    {% if options.back is defined %}
+        {% set actions = actions|merge({'back': options.back}) %}
+    {% endif %}
+
     {% set event = trigger('actions.user', {'actions': actions, 'view': view, 'user': user}) %}
     {% if view == 'index' %}
         {{ widgets.table_actions(event.payload.actions) }}