this allows for better control over led strips.
Modes:
- AUTO: allow other modules to switch LED strip
- OFF: force LED strip off
- ON: force LED strip on
- RGBW values are now only set by SK6812
- MA_LIGHT can now also take into account a brightness value reported
by any node to switch on light only after dawn
- Changing this value requires changing the routine NET_Buffer_Locate
so its best to keep both in one module.
- Redefining it in the individual devices doesn't change the code in
NET_Buffer_Locate
