New OPC hooks, OPC PageTree adjustments, changes required for Dropper to work smoooothly

We need some hooks for Dropper to use less "Hacks" on our side to work great within OPC.

This request will

1. add required hooks
2. make OPC Pagetree labels to be better readable (use Area Title instead of ID, use Portlet Title instead of Class).
3. Apify some Javascript methods to be callable without a click handler.

Feel free to ask if anything is unclear.