This reverts most of commit ede5c9548e.
The one change not reverted is ClockWidget.h, so that the taskbar clock
can continue to notice time zone changes.
In most applications, we invoke tzset once at startup for now. Most of
these are short lived and don't need to know about time zone changes.
The exception is the ClockWidget in the taskbar. Here, we invoke tzset
each time we update the system time. This way, any time zone changes can
take effect immediately.
Introduce the ability to hide the Analog Clock window borde. With this
feature enabled it looks like the clock is floating and integrated into
the desktop.
The "Cube Demo" has the same feature, and was used as inspiration when
implementing the feature in the Analog Clock.
