Allows implementing device specific endpoint creation logic, which is currently
needed for bluetooth endpoints as they need to be created differenly.

This module suspends a node if idle for at least 3 seconds

This is a simpler endpoint implementation that does not require
any node setup. It should be good to use with test nodes (fakesrc/fakesink),
V4L2 nodes, and maybe others in the future.

This module allows wireplumber to create static nodes that match a specific
device using a spa node factory. Matching is optional, and if there is no match,
the node will always be created.

This is now done by the config endpoint module

This keeps track of the default endpoint and selects a default
based on endpoint priorities when devices are discovered

This will be replaced by a new policy based on configuration files

This is no longer used and it is the wrong approach anyway.
A mixer GUI needs to list all endpoints and figure out the controls
from the streams on its own, using the new endpoints API.

This is not used by AGL anymore and it will go away *anyway*
when we switch to the configuration-based logic for
creating endpoints

Running audioconvert in merge+split mode is the only way to make this work with
the adapter, since the adapter does not support passing multiple channels on
a single port right now, and if it does at some point, it will be without a
mixing node on the port, which means we will not be able to mix multiple
audioconvert nodes on the same adapter. In the future we need to consider
writing a lighter volume node with multiple channels support to replace
audioconvert.

The new linking algorithm now takes into account the channel positions and makes
sure to link the correct channels together. Also, it avoids passing the port
proxies inside the GVariants, thus making the algorithm a bit more generic
and easier to unit test.