Initial commit for Waybar JACK monitoring module

-DSP load
  -xruns
  -connected/disconnected state
  -only tested with Pipewire so far but should work with JACK2 as well

 On branch dsp
 Changes to be committed:
	modified:   include/factory.hpp
	new file:   include/modules/jack.hpp
	modified:   meson.build
	modified:   meson_options.txt
	modified:   src/factory.cpp
	new file:   src/modules/jack.cpp

src/factory.cpp

@@ -101,6 +101,11 @@ waybar::AModule* waybar::Factory::makeModule(const std::string& name) const {
       return new waybar::modules::Pulseaudio(id, config_[name]);
     }
 #endif
+#ifdef HAVE_LIBJACK
+    if (ref == "jack") {
+      return new waybar::modules::JACK(id, config_[name]);
+    }
+#endif
 #ifdef HAVE_LIBMPDCLIENT
     if (ref == "mpd") {
       return new waybar::modules::MPD(id, config_[name]);