Ledstrip display

[conejoninja]

A few notes:

• This PR also add a "ledstriper" interface to control a led strips.
• I'm open to change any name, not good naming things, or add more documentation/explanation
• This is more of a crazy idea and I'm not sure it should be on the official drivers repository

It's based on the idea that you could create a display/screen with a ledstrip, like this example. There are a few possible layouts that make sense (parallel, Z, S). There's a limitation on the screen size (as it uses int16) but I think it's enough, a bigger display will probably need a more powerful board (and a ton of money on ledstrips)

[peterhellberg]

The LedStriper type should most likely be renamed to something like LEDStriper since LED is an initialism.