korad-kaxxxxp: implement more generic ID response text checks

korad-kaxxxxp: implement more generic ID response text checks

Either compare the device's response text for IDN queries against a
specific string literal (strict match, compatible with earlier driver
implementations). Or apply a more generic approach which expects to
find the vendor and model names, accepts optional version details,
and transparently deals with several quirks in the process.

Adjust user visible as well as developer centric diagnostics. The
fixed ID response literal became optional. Tell exact literal matches
from the matches of the generic vendor/device approach.

This commit only adds the support code, but does not modify the table
of supported models. Which results in the check logic to always use the
path which strictly matches the device's response against a literal.
The generic approach will only be taken when the supported models table
gets adjusted in future commits.