added 3d control to the SetRGB function (and the pin layout for the transistors are stil hardcoded
added the ability to set maxBright with a potentiometer
added the potentiometer control in the ShiftPWM lib + the layer control is cleaner and integrated in an other function + everything is now easily to change
updated the description of the brightness setting
removed temporary test for the potentiometer implementation
the maxBrigthness variable is now taken into account when the effect level is calculated
minor cosmetic changes
updated readme
commented serial begin (never got this working on my chip)
switched to no-SPI interface so I can use it for my EEPROMs
Revert "switched to no-SPI interface so I can use it for my EEPROMs"

This reverts commit 2dbd4200dec1f16d2c560f4ea717a12049c2cead.
corrected pins
fixed bugs, SetLayers and UseLayer are back to plain ino file temporary, potentiometer still not working
the potentiometer is active but not as it should