Changes

#1314 (May 8, 2024, 6:46:08 PM)

1. icE1usb fw: Implement E1 line monitor task — Sylvain Munaut / detail
2. icE1usb fw: Add AIS error flag and fill it along with LOS from linemon — Sylvain Munaut / detail
3. icE1usb fw: Rework the way LEDs are used and updated — Sylvain Munaut / detail
4. icE1usb fw: Automatically report alarm condition to remote peer — Sylvain Munaut / detail