v0.7 release
Changelog:
- new settings menu
- PRO58 buzzer on/off setting
- long press (not holding) to exit to upper menu
- screensaver disable setting
- RSSI values are visible during calibration
- fix: set last channel on search/fav screen after exiting bandscan/rssi calibration
- only one RSSI graph is displayed in single antenna diversity mode
- reset "factory" settings option