Integration and deprecation of -m option in favor of JSON RPC

[ann0see]

It is worth discussing deprecating the -m option and/or integrating missing features it into JSON RPC. It's not a core feature of Jamulus.

I think we had this discussion a while ago. Cc: @pljones

jamulussoftware/jamuluswebsite#1019 (comment)

[pljones]

Yep, --htmlstatus should probably be marked deprecated in 3.12.0. The client list is available from the server either over UDP (acting as a client, the way @softins's PHP does it) or using the JSON-RPC calls.

[ann0see]

The website already calls it deprecated today: https://jamulus.io/wiki/Running-a-Server#-m-or---htmlstatus

I think we should

• Update the help output in Jamulus to say it's deprecated (Add deprecation warning for -m option #3398)
• Issue a warning in Jamulus if the -m option is invoked (Add deprecation warning for -m option #3398)
• Remove all references to it on the website (Remove HTML status documentation jamuluswebsite#1087)
• Write a discussion post with example how to get the all the outputs from the other APIs (https://github.com/orgs/jamulussoftware/discussions/3508#discussion-8540770)

[ann0see]

Ok. After checking the output it's really just the connected clients' names.