New e-Paper driver for displays supporting partial update.

but right now all you have to do is remove transparent:0 from the finished JSON.

This won't work as the bits in the B64 text are all black. It's not that big a deal, it's easy enough to convert transparent to white in the image. It's just something that slowed down my testing last night.

As far as I know, there's no getRotation - so yeah, trying to do a new Graphics could be a pain.

It would be easy to add, but I didn't want to mess with the Graphics library. That's a much bigger change than updating a module... I am considering adding rotation the .partial parameter list. Maybe make it an option?