Example_RGBMatrix.ino

-renaming sketch file (it's slightly confusing with the firmware that is on the serial backpack controller)
-"ORANGE" actually is YELLOW when you mix red and green...
-made the functions more modular so customers can call the functions from anywhere in the sketch file
-added the set_matrix() function to set the position daisy chained matrix using the command char
-added some lines to reset the frame index using the command char before transferring so that Arduino can write to the LED matrix