Designer Integration: Parse headers for signal/slots of promoted widgets / Handle context menus in Designer

From the web form feedback:
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Creator is great. But I would like a few enhancements.

(1) capability to create a context menu in Designer by dragging and dropping widgets onto a menu form.
(2) capability to connect signals from widgets to slots in a custom class (that I am writing). Designer should read all the header files in Creator and put the slot methods in the popup menu in the Signals&Slots editor. Much better than that would be to have a drag and drop connections editor - drag from a signal source and drop onto a class/object with slots and choose the slot method with a popup menu (something like actions are connected in Apple's XCode IDE).

Good work!
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