Create standard font selection components

We have standard calendar and color chooser components, but a lot of GUI programs allow font selection as well. Since it is a bit tricky to implement the styling (for instance) to show the selected font, having a standard component could be useful for rapidly implementing this capability for new applications.

I envision (perhaps) two flavors: a combobox type that just pops down the possible choices, and a larger Sheet version that allows size and style selection as well, and possibly has a preview field (similar to Word font selection).