Add define to use same pin number of datasheet

You can uncomment
//#define NOT_SEQUENTIAL_PINOUT
to have pin like this
#define P00 0
#define P01 1
#define P02 2
#define P03 3
#define P04 4
#define P05 5
#define P06 6
#define P07 7
#define P10 8
#define P11 9
#define P12 10
#define P13 11
#define P14 12
#define P15 13
#define P16 14
#define P17 15
instead of
#define P0 0
#define P1 1
#define P2 2
#define P3 3
#define P4 4
#define P5 5
#define P6 6
#define P7 7
#define P8 8
#define P9 9
#define P10 10
#define P11 11
#define P12 12
#define P13 13
#define P14 14
#define P15 15