* POC for X9, requires -DBINDING_OPTIONS=YES
* There are apparently 4 valid choices
* - make BINDING_OPTIONS part of standard code
- adapt R9M EU LBT dialog to choice on bind
* - remove option from Companion
- cosmetics
* Compilation fixes
* Rename EXT option to TELEMETRY
* Change test accordingly
* Rename FRSKY to TELEMETRY_FRSKY
* Rename ARDUPILOT to TELEMETRY_ARDUPILOT
* More renames (JETI, MAVLINK, NMEA)
* Fixes to make commit-test happy
* Further tests added to commit-test
* Cleanup
* Rename EXTSTD to TELEMETRY_NONE
* Allow software based volume control
- enable it for AR9X
- rename "HARDWARE_VOLUME" defines to "MASTER_VOLUME"
- adjust build-firmware.py and fwoptions.py
* Software based volume control: Do it right
* whitespace cleanup
* software volume: cleanup/revert some leftovers of undone changes