AxxSolder v3.0.1

Stable release of AxxSolder v3.0.1

Changes from previous release (AxxSolder v3.0.0):

• Implement screen rotation, -180, -90, 0 and 90 deg rotation. This is configured in the settings menue.
• Correct pin numbers for handle_sense_1 and handle_sense_2. Pin 6 and 3 were mixed up in the picture: https://github.com/AxxAxx/AxxSolder/blob/main/photos/Portable_connections.jpg
• Update TC calibration datapoints It was wrongly assumed that the ADC reading at room temperature was 0. This is not the case. This resulted in wrong temperature readings at room temperature. High temperatures were not effected.
• Implement pop-up telling why you cant start heating A pup-up now shows why heating can not be started, either because the input voltage beeing too low (below 8V) or not cartridge inserted.