removed the need to provide the pin argument for Esp8266 NeoPixelBus
where it was ignored.
Added another DotStar color feature.
Fixed DotStar color features to use RgbColor when there is no need for
RgbwColor.
Add two new methods NeoEsp8266AsyncUart800KbpsMethod &
NeoEsp8266AsyncUart400KbpsMethod, which uses UART1 interrupts to
output all pixels asynchronously.
Also, refactor old UART code to share as much code as possible.
Michael Miller
Unai Uribarri