Add ability to mass sync to OBS

[grantjbutler]

Now that we have the ability to create multiple layouts in this tool, we should probably expand the sync feature to allow syncing all layouts to OBS. There's some things to figure out to support this. Specifically, when syncing an individual layout, you can choose which scene it should sync to. When performing a mass sync, should we allow for mapping of layouts to scenes? Should we allow the removal of all the old synced scenes and then creating a new batch of scenes from those layouts? Maybe something else? Not 100% sure yet.