Instead of saving the gameplay and intermission scene globally, save the configured scenes individually for each scene collection.

• When connecting to an OBS instance or when the scene collection has changed (CurrentSceneCollectionChanged), get the current scene collection along with the list of scenes.
• If the current scene collection has no configuration defined, notify the user on the Active Match panel.
• Allow the user to define the scene configuration in the Settings panel as usual, displaying the active scene collection.
  • As obs-websocket doesn't appear to provide a convenient way to get all scenes in all scene collections, we can get by with only allowing the active scene collection to be configured.
• When a configured scene is found to be missing, clear the deleted scene from the configuration, therefore alerting the user to go back to the settings to fix it.

Footnote: Consider that at a later date, keeping configuration parameters per OBS connection might be desired.