Set the font and style for the widget.
The name of the font like 'Arial' or 'arial'.
The size of the font like '12'.
The different font styles.
This widget to aid method chaining.
widget.setFont("PragmataPro", 10, FontStyle.bold, FontStyle.italic);
tkd.element.fontstyle for font styles.
See Implementation
Set the font and style for the widget.