broadcast.go & t/broadcast.html: add Save button to broadcast page

[Saxon Milton]

Currently there is no way to change a broadcast configuration and have it be saved without performing a “Start” or “Repeat” action. It is therefore proposed that we add a “Save” button that simply invokes the saving functionality alone.

This could also evolve to alter any active broadcast. For example, if we have an active broadcast that has the privacy set to unlisted, and we wish to set it to public, we could change the configuration, save it, and then see the effect in the actual youtube broadcast object.

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[Russell Stanley]

Working on this

[Russell Stanley]

The first part of this issue had been implemented and merged into the master branch. The second part involves updating active broadcasts on YouTube in real-time.

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[Saxon Milton]

Any update to the broadcast configuration is now performed through the "save" button, so this issue can be resolved now.