This tests the setup where pipewire fully runs inside docker, #80

Due to the enforcing of unique ids in newer liquidsoap versions, the namespace for auto generated server functions does not comply with the namespace we expect in engine. Here I tested some different approaches in order to try to resolve the issue.

This replaces the code for most of the in and output definitions. The are now read through a yaml config file where they are defined as a list of devices/endpoints. #71, #60, #41, #36

Removed the unused stream endpoints s1,s2,s3,s4 as their implementation is different from s0 and needs to be refactored anyway #71.