New clock - Black and white

@Gordon - this clock has a custom ontouch handler to handle left right top bottom touches.

I think there is a case for an updownleftright UI style.

Bangle.setUI("updownleftright", btn=> {

For clocks where the author wants to click, left, right, top and bottom corners.
I think this would avoid each author making their own handlers for onTouch etc, which could clash with other apps (eg jestures etc).