Add dashboard and search task footer hooks

Implement new hooks requested in kanboard/kanboard#3863

app/Template/dashboard/overview.php

@@ -81,6 +81,8 @@
                             'task'    => $task,
                             'user_id' => $user['id'],
                         )) ?>
+
+                        <?= $this->hook->render('template:dashboard:task:footer', array('task' => $task)) ?>
                     </div>
                 <?php endforeach ?>
             </div>

app/Template/dashboard/tasks.php

@@ -30,6 +30,8 @@
                 <?= $this->render('task_list/task_subtasks', array(
                     'task' => $task,
                 )) ?>
+
+                <?= $this->hook->render('template:dashboard:task:footer', array('task' => $task)) ?>
             </div>
         <?php endforeach ?>
     </div>

app/Template/search/results.php

@@ -24,6 +24,8 @@
             <?= $this->render('task_list/task_subtasks', array(
                 'task' => $task,
             )) ?>
+
+            <?= $this->hook->render('template:search:task:footer', array('task' => $task)) ?>
         </div>
     <?php endforeach ?>
 </div>