[Bf-committers] faster usage of panels via pie menu

[Tom M]

Matt and others, on IRC we were discussing how slow and workflow
disrupting it is to move to the vertical panel layout and then scroll
to the option you want to tweak.

It was suggested that a hotkey combo bringing up a pie menu of the
current available panels would be a lot faster, and would eliminate
the need to scroll, similar to how the F6 key after an operator brings
up the tweak operator menu.

LetterRip