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It does not make sense to toggle night mode
or start another round of countdown during
calibration.

Closes #4.

This allows to access the current state from
another code files.

* The 'int' return signature and the comment
'Returns the number of remaining leds' sounds like the
function would return its current countdown state.
However, it only returns the number of remaining
leds after the button was released. Thus change
the type to 'bool' and return 'true' after a
successful countdown

* Do not use 1 as return value for night mode,
because it is ambigous. Return 'false' instead.

If calibration is finally reliable, let's update the version!

co2_sensor: Add console command for SCD30 reset

See merge request !8

co2_sensor: Do not reset ESP after calibration

See merge request !7

A soft reset of the SCD30 sensor, i.e.
calling `SCD30.reset()` was added in commit
fe023428 to force an instant update of
the measurement interval after bootup.

It seems, however, that the calibration
value is not stored if the sensor is
reset before carrying out at least one
measurement after calibration.
This breaks calibration with the current code,
because the ESP (and then the SCD30) is reset
directly after calibration.

* Trying 10s instead.
* Adding warning if timestep < 10s

Forced calibration should hopefully be more reliable now.

https://codereview.stackexchange.com/questions/260122/interactive-shell-for-arduino

could be useful, but hasn't been integrated
yet.