Support scaled text in vxfw

[tensorush]

Hi, awesome library!

I wanted to ask if there're any plans to add text scaling from the main example to vxfw.Text?

It would be really helpful, scaled text is kind of tricky to handle.

[rockorager]

Thanks!

I think adding it would be a great addition. I haven't played around with it enough to understand what would be required to make it behave well in a generic use case...so I haven't tried to fit it into vxfw yet, but I do plan to get it there eventually. I am open to contributions on this one too - I imagine it being a new widget (ScaledText)? Or possibly a flag that goes on a RichText.Span...I suppose there are use cases for inlining small text for {super|sub}script.

Perhaps that is the limitation that makes this easier to implement: scale < 1 is inlined in a RichText.Span, scale > 1 is a new widget. 🤔