broadcast: allow saving and loading of configurations

[Saxon Milton]

It would be useful if we could save and load youtube broadcast configurations so that we don’t have to fill out the broadcast setup form every time we start a stream. It’s suggested this be done using a Variable that contains JSON. This string could contain a series of broadcast configurations, for example:

‌

[
  {
    "broadcastName": "...",
    "streamName": "...",
    "privacy": "...",
    "resolution": "..."
    "startTime": "...",
    "endTime": "...",
    "rtmpVar": "...",
    "actions": "...",
  },
  {
    ...
  }
]

‌

[Saxon Milton]

This will now be done by saving variables for each broadcast under the scope of “Broadcast”. For example, if we create a broadcast with name “Cuttle Cam” the configuration will be saved in a variable with datastore name “Broadcast.Cuttle Cam”

[Saxon Milton]

Resolved by PR #134.