interactive: Remove old calibration stuff

It didn't work. We will implement a new calibration routine now.

Signed-off-by: Joel Stanley <joel@jms.id.au>
interactive: Introduce new calibration routine

This is to be used to calibrate the openradaio. The intent is to tune
1kHz below a known reference signal, that is the reference is at 1000Hz
on a waterfall.. The resulting calibration value is saved into flash.

The version is bumped to 0.2 for both the program and the in-flash settings
structure.

Signed-off-by: Joel Stanley <joel@jms.id.au>