Function apppend

lib/macro/macro-action-variable.cpp:34–38

	 "AdvSceneSwitcher.action.variable"});

static void apppend(Variable &var, const std::string &value)
{
	auto currentValue = var.Value();
	var.SetValue(currentValue + value);
}

static void modifyNumValue(Variable &var, double val, const bool increment)
{