Save parameters from instrument server and reuse them from the murfey database

[stephen-riggs]

Restarting the instrument server causes parameters to be lost, and the gain reference is not set correctly in messages from the instrument server.
This save these into a new table, and uses them in preference to values from the client/instrument

[codecov]

Codecov Report

Attention: Patch coverage is 22.50000% with 31 lines in your changes missing coverage. Please review.

Project coverage is 28.88%. Comparing base (7601cb4) to head (22b6ab7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #522      +/-   ##
==========================================
- Coverage   28.92%   28.88%   -0.05%     
==========================================
  Files          79       79              
  Lines       10246    10282      +36     
  Branches     1357     1363       +6     
==========================================
+ Hits         2964     2970       +6     
- Misses       7181     7211      +30     
  Partials      101      101              

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