edid functions moved to settings, hdmi_audio added for edid
get_edid
implemented disabling of HDMI audio in settings when display doesn't support it
proxy defaults not used anymore
importing hdmi_supported from system/audio.py
using returns instead of sys.exit in system.display
making sure HDMI can never be accidentally selected
fix hdmi audio status for set-kano-hdmi
Merge pull request #173 from KanoComputing/audio

hdmi_audio added