FreematicsCell7600

I wrote this fork of FreematicsCell back in Feburary of 2021 to add support for the SIMCOM7600 on the Freematic Espirit, but forgot to publish it until now. I leave this here more so for the GPS functionality I add. In the last 10 months, Stanley Huangyc has implemented SIM7600 and has moved from FreematicsCell into a new library called FreematicsNetwork. No one should use the code I'm uploading here in favor for FreematicsNetowrk, but I provide it as a backup. Some examples of how I've used this code are provided.