Bug-fix release fixing:
- GD-5R: Keep button settings.
- GD77/OpenGD77: Fixed RX group limits
- GD77/OpenGD77/RD-5R: Fixed validity detection for contacts
- OpenGD77: Added support for 80 channel zones.
- OpenGD77: Fixed crash on code-plug decode
- GD77/OpenGD77/RD-5R: Off-by-one index error on channel linking
- OpenGD77: Disabled scan-list encode/decode.
- Fixed typo in main window.