copy mpris implementation from infinitime library to itd, where it really belongs

moved dbus.go to an internal utils package
added context function parameter to initMusicCtrl and updated main.go to pass it
updated calls.go, maps.go, music.go, and notifs.go to use utils package for getting a dus connection

main.go

@@ -146,7 +146,7 @@ func main() {
 	}
 
 	// Initialize music controls
-	err = initMusicCtrl(dev)
+	err = initMusicCtrl(ctx, dev)
 	if err != nil {
 		log.Error().Err(err).Msg("Error initializing music control")
 	}