Feature request: Screen saver/blanker

[IrregularShed]

I left the Pi running connected to my Espruino when I had to leave my desk... and then forgot about it and had lunch. About an hour later I discovered my mistake.

Would it be possible to add some kind of screen saver functionality, with the time set in the config file? It doesn't have to go all the way to putting the screen to sleep, just fading the image out would be enough to be helpful.