Display modes

The TUI adapts to the terminal: glyphs follow the locale (a UTF locale in LC_ALL, LC_CTYPE or LANG enables Unicode, anything else falls back to ASCII) and colour honours NO_COLOR and TERM=dumb. Force either on the form with ->unicode(TRUE|FALSE) and ->color(TRUE|FALSE). Here is the same scaffolder in each combination:

	ANSI	No ANSI
Unicode
ASCII