[LAD] Proposal about support for multiple jack-dbus servers

Hello. I looked to MPRIS specification in order to write jack transport client with this interface, and noticed solution, which could be used for jackdbus too. Currently jack serice name is fixed: org.jackaudio.service In MPRIS naming is like <prefix string>.<instance name> (e.g. org.mpris.MediaPlayer2.audacious). For jack it could have this form: org.jackaudio.<server name> or org.jackaudio.service.<server name>. Older name may be kept for compatibility, and most likely to be created by first jack server, appearing in user session. With such approach it could be possible for other daemons, e.g. ladish, to expose jack-like interfaces in more common way. Of course, currently it is done as essential (using of different service names), but it is not standard. With proposed approach it may be possible even to browse jack services. Control tools like qjackctl could even propose some menu (sidebar in patchage) or even (sic! =) transport control rack for better convenience.