Arduino: Use one parameter instead of multiple

Up until now this server used a different parameter for
different
colors/relays. This meant that for setting a different color
to the LED
strip you needed to make up to 3 requests and 4 requests for
the relay.

This changes the system to use a single parameter, a 16-bit
integer. One
byte for each parameter (RGB and relay).
.NET: Include ColorPicker library to repository

I stripped some parts from the library that are not needed for this
project, check out the full version over here:
https://github.com/cyotek/Cyotek.Windows.Forms.ColorPicker
.NET: Use one parameter instead of multiple
Android: Use one parameter instead of multiple