Reduce priority of LED interrupt

Add notes regarding Foxhunt mode and aioc util

Refactored IO naming to explicit IN and OUT in settings module

Refactored IO naming to explicit IN and OUT in settings module

Added debug hooks into audio and PTT system

Updated README with new features of firmware version 1.2.0

Implemented CM108-like feedback on interrupt endpoint, whenever a GPI…

…O state changes (which currently happens only if the GPIO output register is being written)

Added Support for 16 kHz sample rate as well, specifically for direwo…

…lf on ARM computers (divides sample rate by 3 by default)

Initial commit for CM108 style HID endpoint PTT support

Fixed typo in USB string