Adding a new placeholder in render_footer hook.

Allow free elements at the end of the page.

plugins/demo_plugin/custom_demo.css

@@ -4,4 +4,10 @@
 
 .upper_plugin_demo {
     float: left;
+}
+
+#demo_marquee {
+	background: darkmagenta;
+	color: white;
+	font-weight: bold;
 }

plugins/demo_plugin/demo_plugin.php

@@ -74,6 +74,7 @@ function hook_demo_plugin_render_includes($data)
  *
  * Template placeholders:
  *   - text
+ *   - endofpage
  *   - js_files
  *
  * Data:
@@ -89,6 +90,11 @@ function hook_demo_plugin_render_footer($data)
     // footer text
     $data['text'][] = 'Shaarli is now enhanced by the awesome demo_plugin.';
 
+    // Free elements at the end of the page.
+    $data['endofpage'][] = '<marquee id="demo_marquee">' .
+            'DEMO: it\'s 1999 all over again!' .
+        '</marquee>';
+
     // List of plugin's JS files.
     // Note that you just need to specify CSS path.
     $data['js_files'][] = PluginManager::$PLUGINS_PATH . '/demo_plugin/demo_plugin.js';

tpl/page.footer.html

@@ -4,6 +4,11 @@
         {$value}
     {/loop}
 </div>
+
+{loop="$plugins_footer.endofpage"}
+    {$value}
+{/loop}
+
 {if="$newVersion"}
 <div id="newversion">
   <span id="version_id">&#x25CF;</span> Shaarli {$newVersion} is