Support DPV generation for CHMT firmware < 2725B

[hydra]

New features were added in CHMT firmware 2725B
https://www.youtube.com/watch?v=-aJQna2SuS4&t=8s

These new features required changes to the DPV files, and thus the files that are written by this software. The codebase currently has some conditional code to support the old format, but testing is only performed on the latest version due to time constraints/developer-availability.

If you need support for < 2725B and have a good reason not to upgrade the firmware, reply below.

It's likely that code for the old DPV format will be removed in version 2.1 of PnPConvert unless there's a good reason to support the old file format.

If you're in a hurry, you in DPVWritter.groovy you can change as below, but note that it's currently unsupported and running tests will fail:

FormatVersion format = FormatVersion.LATEST

to

FormatVersion format = FormatVersion.LEGACY