* Added support for Sysjoint-Tek / CHELEGANCE JNCRadio VNA 3G
Device reported as JNCRadio and Custom points added under Manage tab.
* Minor change to correct spelling or error msg.
* Style: update type annotations
* Style: simplify extraction of version from metadata
* Style: replace some handwritten classes with namedtuples or dataclasses
* RIZ.py: remove unused import
* Style: remove some redundant lambda constructs
* Marker/Values: remove __init__ parameters
Mutable default values imply some complexity. In this case, the
constructor is always called without arguments.
t52ta6ek