APA106 support

@Aircoookie and any other devs, I have some APA106 leds that I would like to use with WLED.
I see that they are not currently supported.

I also see that WLED uses (or used) NeoPixelBus to drive the leds, NeoPixelBus supports APA106.

How do I go about adding APA106 to the WLED code now that npbwrapper.h is no longer used?