Base Params
Isolated class for store LiveData variables, it used by ViewModel.class BaseParams {
/// display progress widget
LiveData<bool> get loading;
/// event emitter for display [SnackBar]
ObservableData<UiMessage> get uiMessage;
/// update [_loading] with new [value]
void setLoading(bool value);
/// emit new [UiMessage]
void emitUiMessage(UiMessage value);
}