Adds the ability to have placeholders in panel commands. For example: /example %cp-placeholder1%.
Custom variables via placeholders can now be carried across from one panel to another using the open= function
The redirect feature has been removed due to the custom variable feature superseding it.
Added a duplicate feature to allow items to be duplicated into different slots in a panel. Example: duplicate: 0-20,24,27 will duplicate the item into the slots 0 to 20, 24 and 27 (duplicated items will not appear in the editor)