Module: Allow to define a dashboard pane's properties

Since dashboards are now alphabetically sorted as well, we need some way
to affect this as the old behaviour was to sort them as they were registered

refs #5600

library/Icinga/Application/Modules/Module.php

@@ -308,10 +308,13 @@ class Module
             /** @var DashboardContainer $pane */
             $navigation->addItem(
                 $pane->getName(),
+                array_merge(
+                    $pane->getProperties(),
                     array(
                         'type'      => 'dashboard-pane',
                         'dashlets'  => $pane->getDashlets()
                     )
+                )
             );
         }
 
@@ -322,12 +325,18 @@ class Module
      * Add or get a dashboard pane
      *
      * @param   string  $name
+     * @param   array   $properties
      *
      * @return  DashboardContainer
      */
-    protected function dashboard($name)
+    protected function dashboard($name, array $properties = array())
     {
-        $this->paneItems[$name] = new DashboardContainer($name);
+        if (array_key_exists($name, $this->paneItems)) {
+            $this->paneItems[$name]->setProperties($properties);
+        } else {
+            $this->paneItems[$name] = new DashboardContainer($name, $properties);
+        }
+
         return $this->paneItems[$name];
     }