Allow delete multiple items - Group pages

- add checkboxes, buttons and functions to groups page;
- add checkboxes, buttons and functions to clients page;
- add checkboxes, buttons and functions to domains page;
- add checkboxes, buttons and functions to adlists page;
- move function to `utils.js`;
- fix CSS after insert a new table column;

Signed-off-by: RD WebDesign <github@rdwebdesign.com.br>

groups-adlists.php

@@ -63,6 +63,7 @@
                     <tr>
                         <th>ID</th>
                         <th></th>
+                        <th></th>
                         <th>Address</th>
                         <th>Status</th>
                         <th>Comment</th>