Add xrun log functionality to studio-controls

[codecollider]

Hi,

hope this is the right place for requests:

I'm using Ubuntu Studio with studio-controls and I'm really missing a kind of log window (like in Qjackctl or in Carla) for the xruns, i.e. with timestamp, in what instance they occurred, etc. That would be much helpful in hunting down xruns.

[ovenwerks]

If I add this it will probably be after 2.1.0. In the mean time, open a terminal and type in: less +F ~/.log/jack/jackdbus.log or: tail -f ~/.log/jack/jackdbus.log (you might want to rm that file first as it tends to get very long)