Handling updates to the JavaFX Caspian look

[Richard Bair]

Thank you for bringing this up!

> I don't think anyone wants to end up in the same situation as Swing, where the default L&F is Metal, because moving the default to a more modern L&F would potentially break (or at least maim) many deployed Swing applications.

I find this very compelling. We've been down this road before (not being able to fundamentally alter the default look) and it was UGLY! I like the idea that people can install a specific default stylesheet and remain compatible or get the latest and greatest automatically.