Enable Context Help (Shift+F1) using "QT's - What's This"

... adds "What's this" to (hopefully) most of the widgets (please report on missing ones)
... defines draft "Whats' this" texts including a context specific WikiLink

.. How-to-use: Help Key for all platforms is <Shift>+<F1> + in some widgets "RightMouse - Click" as well

... Tested on Win and Mac (On Mac QtMacButton seems not supporting "What's this") - so here <Shift>+<F1> has no result.

... ToDo: Create final texts and links based on the to be updated 3.11 Wiki