pulseaudio control on mesh clients

src/freedombone-image-customise

     chroot "$rootdir" apt-get -yq install horst
 
     # for sound level control
-    chroot "$rootdir" apt-get -yq install alsa-utils
+    chroot "$rootdir" apt-get -yq install alsa-utils pavucontrol
 
     # to play various media types
     chroot "$rootdir" apt-get -yq install vlc