TAMPA, Fla. \- Baker Mayfield got a new deal, but that isn’t the only thing new with the Bucs starting signal caller. He’s having to learn a new offense under first-year offensive coordinator Liam Coen. Coen says Mayfield is picking it up fast. “A calm confidence I think,” Coen said in describing Mayfield. “Yes, we are installing and teaching a new offense, but he (Mayfield) knows a lot of these things already. Him just taking it over. He has done a great job in the meeting rooms. Hey Man, make sure you’re here. That’s what we’re trying to establish. The confidence of throwing the football has…