many fixes, add radioscope
- Added option to show/hide clock (with/without date)
- ADS-B RX app aircraft position jitter
- Radiosonde beep pitch RSSI improvements. Keeping current frequency in battery backed RAM
- fix save frequency gui glitch
- Adding radiosonde txt
- Feature radiosondes beep 371
- fix for freq manager save file
- fix in the scope of issue
- FrequencyStepView field to the TransmitterView class