Feature request: Command argument for path to configuration file

[backporchengr]

Adding an argument to backend server startup command for specifying configuration file path facilitates running multiple simultaneous camilladsp <-> gui server pairs. Individual camillagui configuration files with distinct camilladsp web socket port <--> HTTP port mapping, statefile_path and logfile path allows multiple camilla instances to coexist.

Useful for situations such as having audio systems in several rooms within a household which may or may not be active simultaneously.

[HEnquist]

This is now implemented in the next30 branch for camilladsp v3.0, see https://github.com/HEnquist/camillagui-backend/tree/next30?tab=readme-ov-file#command-line-options