pipewire.conf uses a different format now

Required for the device event type-info

Depends on DeviceEvent type-info, available on pipewire master as of today

deactivate() is normally called from WpCore's dispose() and
that's too late to convert a weak WpCore ref to a strong one,
so we cannot find the WpConfiguration and remove the engine.
So, keep a reference to the WpConfiguration earlier.

If the engine is not stopped on time, proxies on the export_core
are destroyed after their core and pipewire complains

WpDevice, WpSpaDevice, WpNode, WpImplNode, WpObject and object features

port module-monitor to follow the changes

A new desktop profile without endpoints will be added.
The goal is to be compatible with media-session in the short term

Use the unused 'K' format letter in the varargs builder & parser methods

* Use a more complete API to introspect SPA types
* Avoid the need for the Tables enumeration; the tables
  are now registered with a string
* Avoid the need for initialization, work directly on spa_types
  and other static data
* Allow working with Object pods that are not Params;
  the PARAMS table was previously hardcoded in the pod implementation
* Add a different dynamic type registration system, closer to
  how spa type works. The only regression is that we can no longer
  register additional custom object fields (custom SPA_PROP_* for example),
  but this feature can be re-added later

Still missing a way to get the default endpoints, but this
is going to change and use the metadata API

... and make WpIterator Lua-friendly so that it can be used
with the generic for loop

Fixes #22

Fixes #20