Isolating CAVA instances

[Thesola10]

I have noticed, by accident, that when I kill cavalcade manually, the cava process stays open and keeps feeding height values. As such, when cavalcade is run again, and it runs cava again, it jitters because two instances are controlling height.

I was wondering if there was a better solution for this, which could even be multi-user friendly (using a common FIFO under /tmp isn't really), or ideally multi-process friendly, like the FIFO being placed under /run/cavalcade/$PID for example.

[fabienli]

I'm using Hogfather as well, without issue, however I didn't try if the Auth-PDO plugin would interfer with the XML-RPC mechanism ... that might be something to try on a debug install.