Incorporated Robert's "swim lane" code to eliminate

slot overlaps that made weekend effectively unusable.

Reworked animation code to use CSS animations for
smoother performance.

Calendar redraw is now completely event driven rather
than refreshed once per second.

Expanded meetings can now be closed with escape key.

Refactored code to make it more idomatic. Eliminated
many globals.

Reformatted to reflect a more consistent coding style.
 - Legacy-Id: 12340

Author: adamroach