Add swiping support to navigate left/right.
Support vertical swipes in mooswipe.
Remove 'idle' overlay.

The overlay blocks the first mouse/touch events after the user becomes
'active'. Manual event forwarding was too slow. We will leave with the main
pointer being visible over links..
Include touch events in the idle handler.
No not flash the header when calling hideHdr more than once.

This can happen due to the user becoming 'idle' after using the keyboard/touch
events, but without moving the mouse.