All of loon's displays access a set of common options. This function sets the font for the title bar of the displays.
l_setTitleFont(size = "16", weight = "bold", family = "Helvetica")
the font size.
the font size.
the font family.
the value of the named option.
l_getOptionNames
, l_userOptions
,
l_userOptionDefault
, l_setOption