Configurable activity and project number (#4729)

* added configurable activity number
* added configurable project number
* fix deprecations
* added some tests for entity exporter
* better configuration of dropdown pattern for customer, project and activity

templates/project/details.html.twig

@@ -85,6 +85,14 @@
                         </td>
                     </tr>
                     {% endif %}
+                    {% if project.number is not empty %}
+                    <tr>
+                        <th>{{ 'project_number'|trans }}</th>
+                        <td colspan="3">
+                            {{ project.number }}
+                        </td>
+                    </tr>
+                    {% endif %}
                 {% endif %}
                 {% if project.hasBudget() and is_granted('budget', project) %}
                     <tr>