Nonsense calibration if sweep is paused before the calibration

[yarda]

Reproducer:

1. pause sweep (stimulus/pause sweep)
2. do all calibration steps while the sweep is paused (cal/calibrate)

This will result in nonsense calibration and very long numbers for SWR (with many digits overflowing the display width).

The firmware should either unpause the sweep before the calibration or inform user that the calibration cannot be done with the paused sweep (and it shouldn't allow to proceed).

[yarda]

FW 0.7.0-20200223

[DiSlord]

Thanks, i add sweep operation for collect data in next Pull Request to fix it

[DiSlord]

Revert add this feature, need find better solution :(