A few changes to speed out readout of AMAC
- Remove 1ms sleep after AMACv2::wrField.
- Add AMACv2::AM enum that lists all of the AMACv2 AM quantities.
- Add AMACv2::readAM for reading a specific quantity using the AM block. Includes support for multiplexed quantities.
- Modify AM update sleep times to 1ms consistently within code. Eviendence is that it is ~600uS.