The alsa.pcm devices currently use "device.api" = "alsa:pcm"
but then the node overrides this later to just "alsa", which
is confusing. For now, let's match "alsa:pcm" in the monitor,
even though this does not appear on the node later.

This commit fixes device preferences in wireplumber.conf,
which were broken because the alsa endpoint names were empty
of info about the alsa device

next version is going to be 0.2 from this branch

This allows the bluealsa gstreamer helper to link to the speakers
constantly, with both A2DP and HFP streams. If this is not enabled,
only one of those will manage to connect, randomly.

This is definitely something to be superseeded by proper policy
management implemented with configuration files

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

This is complex and it gets in the way of forward-porting
the bluez-alsa integration bits from the 0.1 branch.

simple-policy will be removed anyway and replaced with
the configuration-based logic that is in the works, so
we will not need this code again, even if we switch back
to the native pipewire bluez5 integration

In current pw master the behavior has been changed to not activate
the "On" profile on alsa devices by default, because of the DeviceReserve
D-Bus API implementation in media-session.

This is a hack here to get the previous behavior. In the future
we should have a way to configure profiles, as well as to pick
a sensible default by autodetection.

When the audioconvert starts, it emits 2 ports, but when we set the PortConfig,
it removes them and re-creates them. Previously, the stream class would not
remove the old port proxies from the list and therefore they existed twice.

It is also necessary here to store the proxies earlier, when they are added,
instead of when they are augmented, so that we can ensure they are removed.
Previously we would hit an issue where:
 - port proxy is added, augmented
 - augment completes but the GTask wants to complete asynchronously:
   it stores a ref on the proxy and adds an idle source
 - server removes the proxy, we delete it from the core's list
 - the GTask now calls the augment callback, which stores the (removed)
   proxy on the stream's port_proxies list...

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.

This is a remainder from the old WpRemote, which is gone.
I would re-add the property, but it's not worth it, since libpipewire
prints it as well by default

GVariant is instructed to store a 64-bit unsigned integer (mode "t")
but we pass it a pointer to a pointer to read this value out,
which will crash in 32-bit architectures, as the pointer doesn't have
enough bits and g_variant_lookup therefore corrupts the stack.

Because the proxy_event_destroy() handler now takes a ref to the
WpProxy, which is an error to do in finalize()

This is a generic WpMonitor loader that sets up the WpMonitor
properties from the module arguments and applies some well-known
properties to the device & node objects

This class wraps a SPA monitor and creates all
the devices and nodes as they are being discovered

A method to copy specific keys from one properties set to another

This is very easy to reproduce when the pipewire-alsa integration
is installed and you do 'arecord -l'; the alsa plugin connects and
disconnects again before the proxy is ready.

In this case we have to skip remote-global-added and we also have
to be careful with the references: the global-removed callback is
called earlier, so the core's reference to the proxy is gone and
the GTask is the only thing holding a reference to the proxy.
When we unref the GTask, the proxy is also unrefed, so we have
to keep an additional reference in order to avoid crashing
when accessing the hash table below.

In practice we always create a remote and connect to pipewire.
Any other scenario is invalid, therefore, it is not justified
to be confused with so many classes for such small functionality.
This simplifies a lot the modules code.

Also, this commit exposes the pw_core and pw_remote objects
out of WpCore. This is in practice useful when dealing with low-level
pw and spa factories, which are used in the monitors. Let's not
add API wrappers for everything... Bindings will never use this
functionality anyway, since it depends on low level pipewire C API.

Since the alsa endpoints class was renamed...

In case the proxy was created with wp_proxy_new_wrap(), the event
listener was not attached on the pw_proxy