Replace `roundLengthInSeconds` with `roundLength`

[domenukk]

We have decided to go with milliseconds everywhere, so ctf.json should probably be changed to reflect this decision.

[Trolldemorted]

*everywhere in the m2m interfaces

[domenukk]

So you argue for inconsistency, and against the added precision, in this case, to save a simple multiplication? Or was this comment solely informational?

[Trolldemorted]

This is no inconsistency, this is a different spec only transitively related to the enochecker API. If you can convince the users of EnoEngine that this is a good idea we can do it /shrug