subscribeContent
fun <C : EventContent> ClientEventEmitter<*>.subscribeContent(contentClass: KClass<C>, priority: Int, subscriber: Subscriber<ClientEvent<C>>): Unsubscriber
inline fun <C : EventContent> ClientEventEmitter<*>.subscribeContent(priority: Int = Priority.DEFAULT, noinline subscriber: Subscriber<ClientEvent<C>>): Unsubscriber
Subscribers have to be aware to unsubscribe when the scope of the subscriber is destroyed.
Return
A function to unsubscribe.