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)

include/factory.hpp

@@ -72,6 +72,9 @@
 #ifdef HAVE_LIBJACK
 #include "modules/jack.hpp"
 #endif
+#ifdef HAVE_LIBWIREPLUMBER
+#include "modules/wireplumber.hpp"
+#endif
 #include "bar.hpp"
 #include "modules/custom.hpp"
 #include "modules/temperature.hpp"