MutableNovaRegistry
fun <T : NovaRegistryElement<T>> MutableNovaRegistry(key: Key, reloadable: Boolean, unknownEntryFactory: (RegistryEntry.Nova<T>) -> T? = null): MutableNovaRegistry<T>
Creates a new, possibly reloadable, MutableNovaRegistry identified by key that may use unknownEntryFactory to create values for unregistered keys.