feat: wireplumber support

Adds basic support for showing volume via wireplumber. Allows specifying
the node-id or falling back to the default Audio/Sink node id if node-id
is not set. If tooltip on hover is enabled, will show `{node_name}` by
default otherwise `tooltip-format`.

Format replacements:

`{volume}` - Volume in percentage
`{node_name}` - The node's nickname (`node.nick` property)

meson.build

@@ -101,6 +101,7 @@ libevdev = dependency('libevdev', required: get_option('libevdev'))
 libmpdclient = dependency('libmpdclient', required: get_option('mpd'))
 xkbregistry = dependency('xkbregistry')
 libjack = dependency('jack', required: get_option('jack'))
+libwireplumber = dependency('wireplumber-0.4', required: get_option('wireplumber'))
 
 libsndio = compiler.find_library('sndio', required: get_option('sndio'))
 if libsndio.found()
@@ -247,6 +248,11 @@ if libjack.found()
     src_files += 'src/modules/jack.cpp'
 endif
 
+if libwireplumber.found()
+    add_project_arguments('-DHAVE_LIBWIREPLUMBER', language: 'cpp')
+    src_files += 'src/modules/wireplumber.cpp'
+endif
+
 if dbusmenu_gtk.found()
     add_project_arguments('-DHAVE_DBUSMENU', language: 'cpp')
     src_files += files(
@@ -330,6 +336,7 @@ executable(
         upower_glib,
         libpulse,
         libjack,
+        libwireplumber,
         libudev,
         libinotify,
         libepoll,