Allow viewing context of an audio segment

[hudson-newey]

Users have regularly expressed the desire to see the context from where an audio segment was generated (essentially zooming out a spectrogram).

We might be able to support this through a contextUrl column (in the input dataset) or similar

[atruskie]

A couple of solutions:

1. we natively support context
   • we would need to be able to show different URLs
   • contextUrl?
   • or a function to resolve media (so we'd need to know about start and end offsets)
   • we require annotation bounds: so we render the window for the annotation, and assume URL is the context of an appropriate length
2. We leave this up to the implementor
   • not a solved a problem for stand alone
   • implementor would provide a button/link that has whatever behaviour they want
   • e.g. Ecosounds provides a context link in the template, that pops a dialog with a larger spectrogram when clicked. It can do that because it a lot more knowledge the source audio

We're probably leaning towards option 2. It keeps the verificiation-grid simple and let's implementors create any solution