bugfix: in shairport-sync's conf file output_rate should be number form
(except "auto")
bugfix: audio_backend_buffer_desired_length should in "general" section
enhance: option and text imporvement
cleanup: remove invalid options in shairport-sync's conf file generate
feature: add allow_session_interruption and session_timeout option
bugfix: restart shairport-sync when new setting submitted on luci
enhance: some text change and file rename