Panel font properties

[d.healey]

I use panels all the time for drawing text. Sometimes I want to share a paint routine between multiple panels but I want the font/font size for the panels to be different. Currently I have to hardcode the fonts. I think it would be better if panels had font properties like some of the other controls.

@Christoph-Hart I think I could add this myself but I want to know if you think it's a good idea?