New Retropie themes meant for 640x480 and/or 3.5" screens

[RxBrad]

Both themes just landed on RetroPie-Setup yesterday, so they should actually be pretty easy to install now. They work best if you have an up-to-date version of RetroPie with the Game Collections features (and if your Pi can handle it, video previews).

Just a heads up to everyone. Maybe these should be preloaded in the new image for the Freeplay Zero and Freeplay CM3? (I sooooo can't wait for my CM3!!)

Gameboy Zero 3.5" Theme for EmulationStation
https://github.com/rxbrad/es-theme-gbz35

Gameboy Zero 3.5" Dark Theme for EmulationStation
https://github.com/rxbrad/es-theme-gbz35-dark