With fast-food customers revolting over higher prices, chains like McDonald's, Burger King and Wendy's are bringing back the value meal.Nearly 80% of Americans said they feel fast food has become a luxury and are eating out less, according to a LendingTree survey. To try to lure them back, fast-food chains have been touting their value.It's a similar playbook to the one those chains have used in the past, and the competition has sparked what some are calling a value menu war."This has always been an industr ...