Add line number to goto

[kevinkehl]

It could be useful when navigating large files with lots of exports (read: libraries) to provide a line number for the export as well as file path for the goto function. This might be an editor-breaking change, since the goto response is currently just a string, not an object. We could add another top-level field to avoid the breaking change, but that wouldn't be ideal. Thoughts? I'd be happy to work on this if it sounds useful.

[lencioni]

Another possibility would be adding a flag of some sort to specify the format of goto. e.g. goto --format=json

[trotzig]

I like this idea, and I wonder if we could make a cheap test in one of the clients before we try it out? Clients now what variables they go to, and they can make a best-attempt at finding the export in the goto file. If it feels good, we can make it part of the daemon.