alpha5 - added live-position-tracking

GCodeAFMotorV2.ino

- removed unneeded define UnitOfMeasuring
- add new define SendPosWhieMoving (for live-tracking)
- correct some code

line.ino:

- add hardware limit switch query
- converted two short notations to long versions (readabiity)
- some changes at position-system

oneStep.ino:

- some tweaking on software limit switches
- corrections on position system
- add position output after every step
Update README.md