#2008 - Add warnings if some active modules are obsolete.

- added module::get_obsolete_modules_message function
- put message on admin/dashboard
- put message on admin/modules
- put message on upgrader
- updated unit test golden file xss_data

modules/gallery/views/admin_dashboard.html.php

@@ -31,6 +31,13 @@
     });
   });
 </script>
+<div>
+  <? if ($obsolete_modules_message): ?>
+  <p class="g-warning">
+    <?= $obsolete_modules_message ?>
+  </p>
+  <? endif ?>
+</div>
 <div id="g-admin-dashboard">
   <?= $blocks ?>
 </div>