Available symbol-sizes for Micro QR-Code.
=0: Compute size of Micro QR-Code symbol automatically
=1: Fixed symbol-size 11 x 11 squares (Version M1)
=2: Fixed symbol-size 13 x 13 squares (Version M2)
=3: Fixed symbol-size 15 x 15 squares (Version M3)
=4: Fixed symbol-size 17 x 17 squares (Version M4)