users can now choose the alt-tab style in the applet-configuration UI. Add "Dock" as a style.
open settings page directly from quick-help page
add a popup menu that opens settings
don't let stray mouse click pass through to underlying element
some editing of settings

rephrase one description
move settings around
no delayed display when activated from the applet icon
regression fix: determineScrolling must handle empty app switcher
try to make the switcher appearance a little swifter