Support for WS2805

[vrebagliati]

Describe the solution you'd like
NeoPixelBus should support communicating with the WS2805 and manage the five channels it has.

Additional context
The WS2805 is a relatively new chip, which is starting to show up in some commercial products. It would be useful to the community being able to control these new LED.

I've got a datasheet from here

And I found out about this new chip in this Aliexpress page.

[Makuna]

Added NeoRgbwwFeature and common variant orders of the RGB elements.

#765

[Makuna]

May require a slower data rate, spec states 600Kbps. The APA106 could be used as the timing is the same but the reset time is not long enough.

[Makuna]

Add slower rate methods for Ws2805 if the normal Ws2812x doesn't work.

[Makuna]

https://github.com/Makuna/NeoPixelBus/releases/tag/2.7.9