This patch adds the ability to Kickoff to set its layout according to the direction the popup is appearing relative to the launcher button, to improve the ergonomics of kickoff when its launcher is not in the standard position.

Assumption 1: The hardcoded tab order defines a desirable priority order

Goal 1: TabBar alignment is perpendicular to direction of mouse travel from launcher to target, to prevent mousing over non-target tabs and potential unnecessary tab switches

Goal 2 the movie: Tabs are ordered by decreasing priority along the mouse travel vector away from the launcher Constraint: The search widget is different to the tabs and the footer is of lowest priority so these should always be situated furthest away from the origin

This gives vertical tabs when Kickoff is used in a vertical panel, and it reorders the tabs so the Favourites tab is always closest to the launcher, etc.

Paint code still needs fixing to paint tabs right when vertical.

Odd glitch when resizing kickoff on a vertical panel with launcher in SW or SE position, causes the menu to slide off the screen - debug to handle this is left in intentionally.