The toggle button is a push button that needs to be clicked once
to toggle on, and one more time to toggle off.
The Fl_Toggle_Button subclass displays the "on" state by
drawing a pushed-in button.
Buttons generate callbacks when they are clicked by the user. You
control exactly when and how by changing the values for type()
Creates a new Fl_Toggle_Button widget using the given
position, size, and label string.
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