EventMessage:
| BrowserTypes.PrivateChannelOnAddContextListenerEvent
| BrowserTypes.PrivateChannelOnUnsubscribeEvent
| BrowserTypes.PrivateChannelOnDisconnectEvent
| BrowserTypes.BroadcastEvent
| BrowserTypes.IntentEvent
| BrowserTypes.ChannelChangedEvent
| FDC3Event
| PrivateChannelEvent