* move addSelectionEntry to AdvSceneSwitcher class and allow select entry to be 'selectable'
Can be useful for implementing 'current transition' as an option or just allowing to select 'None' for screen region ignore
* Add option to select 'current transition'
* use GetWeakSourceName() where possible
* add getCurrentScene() to scene group
* silence OBS warning log and fix typo in audio switch
* extract showing initial status of widgets to function in generic switch
