By Daniel Kline The fast-food giant has big plans to add not just one sandwich, but a whole new lineup designed to cash in on a craze. Chicken has become a fast-food battleground. Since Popeyes kicked off the craze with its famed chicken sandwich which caused people to wait in lines, it feels like every chain has tried multiple variations of sandwiches that involve fried chicken in some fashion or other. Burger King, a Restaurant Brands International (QSR) – Get Restaurant Brands International Inc. Report brand like Popeyes, could arguably be called a chicken sandwich pioneer. It brought its c…