void GetAvailableParameterHandles ( [TArray](API\Runtime\Core\Containers\TArray)< [FNiagaraParameterHandle](API\Plugins\NiagaraEditor\ViewModels\Stack\FNiagaraParameterHandle) > & AvailableParameterHandles, [TMap](API\Runtime\Core\Containers\TMap)< [FNiagaraVariable](API\Plugins\Niagara\FNiagaraVariable), [UNiagaraScript](API\Plugins\Niagara\UNiagaraScript) * > & AvailableConversionHandles, bool bIncludeConversionScripts ) const