Enhance Load Mixer Channels

[pcar75]

Discussed in https://github.com/orgs/jamulussoftware/discussions/3063

^{Originally posted by pcar75 May 10, 2023}

Currently (3.9.1) this facility does no error checking and expects the full 250 "fader" entries (like jamulus.ini) to be present.

Feature request :
Enhance this function to verify and add , or update if already present , fader entries (1 < nb <= 250 ) to jamulus.ini.

Suggestion : on the hypothesis that tag# have no dependence on Alias / Name , and new entries are always added from tag# 0 upward and discarded after tag# 249 Re-tag changes (entries new and updated) from tag#0 ( or tag#1 if tag#0 is reserved for "own user").

Ref : Discussion #3063 , #2842