void NotifyParameterRenamedExternally ( const [FNiagaraVariableBase](API\Plugins\Niagara\FNiagaraVariableBase) & InOldVar, const [FNiagaraVariableBase](API\Plugins\Niagara\FNiagaraVariableBase) & InNewVar, [UNiagaraEmitter](API\Plugins\Niagara\UNiagaraEmitter) * InOptionalEmitter )