add ability to automatically scale text to fit in the bounds supplied

[greay]

currently, there's no way to do this builtin, and it would be incredibly useful. The metrics returned by richtext.create() don't seem to include the width, so doing it after the fact poses some problems as you have to loop through the words and calculate the full width yourself.

[britzl]

Good feature request! I can't say for sure when I have the time to add this feature.