using 4 single leds instead of rgb strip

[xcawhy]

RGB_4LEDS.zip

This code is for using different colour single leds for same effects.

I added a new byte "w" in struct rgb with "r,g,b" and added new byte "v" in struct point in the file RGBEffects.h

I added "int white", "int whitePin", "_whitePin", "colour.w", "int _dw" variables where necessary.
In cube pattern, I made some changes.

In examples I changed the code to use extra led.