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