Feature: Add synth connect/disconnect to track view track

[Josh Wolfer 94]

I'd like to add a synth connect/disconnect button into the track view within the instrument track. 

This will make it a lot easier to enable and disable synths without having to open up the synth rack view. Other DAWs have this ability and it's rather convenient. 

This will especially make it easier to work off of a large template file where most / all of the synths start in a disconnected state and then are enabled as needed. 

Also, for some reason Connect/disconnect is only in the synth rack when it's floating. When it's part of my right side multidock, the option isn't visible at all, which is doubly annoying. I had to look up the option in the manual, because I couldn't find it.