Not really a hard requirement, wrt libpipewire API, but it's
hard to keep runtime compatibility with earlier versions when
it comes to configuration options

We no longer have the audiofade-related code

Simple library that uses sockets for inter-process communication. It provides an
API to create server and client objects. Users can add custom handlers in the
server, and clients can send requests for those custom handlers.

This is also what pulseaudio uses, so now the volumes in wpctl match what
pulseaudio tools report and they make a lot more sense from the user's POV

The == are not valid checks to appear in a .pc file, apparently,
and this breaks the generated wireplumber-0.4.pc file that copies
these version checks as they appear in meson.build

see also pipewire/pipewire!481

meson can't find project options before executing the project() command :(

This reverts commit 8bff0cc6.

and drop cpptoml dependency as well

By default system-lua=false, so the bundled version is built.

The default_library for the lua subproject is also set to static
now, so that we don't need to install liblua and mess up the system.
For existing build trees, this needs to be switched manually now with
-Dlua:default_library=static (or just wipe the build dir and start clean)

Required for the device event type-info

Use the same set of warning flags that pipewire uses

See #20

Disable m-session-settings for now, as it needs further work

This is an attempt to unclutter the API of WpProxy and
split functionality into smaller pieces, making it easier
to work with.

In this new class layout, we have the following classes:

- WpObject: base class for everything; handles activating
|           and deactivating "features"
|- WpProxy: base class for anything that wraps a pw_proxy;
 |          handles events from pw_proxy and nothing more
 |- WpGlobalProxy: handles integration with the registry

All the other classes derive from WpGlobalProxy. The reason
for separating WpGlobalProxy from WpProxy, though, is that
classes such as WpImplNode / WpSpaDevice can also derive from
WpProxy now, without interfacing with the registry.

All objects that come with an "info" structure and have properties
and/or params also implement the WpPipewireObject interface. This
provides the API to query properties and get/set params. Essentially,
this is implemented by all classes except WpMetadata (pw_metadata
does not have info)

This interface is implemented on each object separately, using
a private "mixin", which is a set of vfunc implementations and helper
functions (and macros) to facilitate the implementation of this interface.

A notable difference to the old WpProxy is that now features can be
deactivated, so it is possible to enable something and later disable
it again.

This commit disables modules, tests, tools, etc, to avoid growing the
patch more, while ensuring that the project compiles.