This is provided only to emulate the Forms Timer widget. It works by
making a timeout callback every 1/5 second. This is wasteful and
inaccurate if you just want something to happen a fixed time in the
future. You should directly call
Fl::add_timeout() instead.
Creates a new Fl_Timer widget using the given type, position,
size, and label string. The type parameter can be any of the
following symbolic constants:
FL_NORMAL_TIMER - The timer just does the callback and
displays the string "Timer" in the widget.
FL_VALUE_TIMER - The timer does the callback and displays
the current timer value in the widget.
FL_HIDDEN_TIMER - The timer just does the callback and
does not display anything.