Change initial values for MAP/RPM fuel mapping.
- Size 20x25 = 500 step.
- MAP start=0, step=5  (end=100)
- RPM start=800, step=100 (end=3300)
Add ADC frequency selection on initialize function (default 4MHz).
Update Read/Write fuel mapping command.
- 1st param (2 bytes) for offset.
- 2nd param (1 byte) for count.
- 3rd till end is data.