Refactor

Scan range in spectrum

Tighter constraints for S0, S9 s-meter EEPROM settings egzumer#252

S0 and S9 value settings egzumer#174

Github actions update

Spectrum refactor

READ MANUAL prompt for unlocking TX

Delete immediate applying of CTCSS/DCS while scrolling options in the…

… menu.

This also caused the option change not to be discarded on EXIT

Added second discharge curve for 2200mAh type battery and hidden BatT…

…yp menu entry

Set the backlight to minimum on reboot