Feature: allow to convert to PDF from Chill and group action button on document

BREAKING CHANGE: avoid using the macro for download button. To keep the UI clean, use always the new "group of action buttons".

src/Bundle/ChillActivityBundle/Resources/views/Activity/show.html.twig

@@ -168,7 +168,7 @@
                     {% if entity.documents|length > 0 %}
                         <ul>
                             {% for d in entity.documents %}
-                                <li>{{ d.title }}{{ m.download_button(d) }}</li>
+                                <li>{{ d.title }} {{ d|chill_document_button_group() }}</li>
                             {% endfor %}
                         </ul>
                     {% else %}