Litemenu contexthop

Created by: zeffii

This demonstrates the slightly obscure way to dynamically populate menus, there are pros and cons to this approach. I will focus on the positive.. this lets us totally hot-evaluate a new menu and submenus.

to test, switch to this branch

1. hit f3 and type pop....ulate , it will show the populate lite menu operator behind the scenes this populates a CollectionProperty with items, all of which contain a StringProperty called item.heading, these headings are used as a submenu lookup.
2. hit ctrl+shift+] (right bracket) this will display a menu, with submenus (that are just layout.labels for now.

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the cons of this approach are, the menu must be populated once per active node_tree. I suspect this could be done in the builtin nodetree update function...