Introduce htmx in sith files

* Convert FileModerationView into ListView and add pagination with htmx
* Don't allow sas moderation in file moderation view
* Split up base.jinja and introduce base_fragment.jinja
* Improve FileModerationView performances and make it root only
* Add permissions tests for file modération

core/templates/core/base/tabs.jinja

@@ -0,0 +1,9 @@
+{% if list_of_tabs %}
+  <div class="tool_bar">
+    <div class="tools">
+      {% for t in list_of_tabs -%}
+        <a href="{{ t.url }}" {%- if current_tab==t.slug %} class="selected_tab" {%- endif -%}>{{ t.name }}</a>
+      {%- endfor %}
+    </div>
+  </div>
+{% endif %}