Begin to support a settings file -- not working yet.

scripts/shairport-sync.conf

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+// Sample Configuration File for Shairport Sync
+
+// General Settings
+general =
+{
+//	name = "Music Player"; // default is "Shairport Sync on <hostname>"
+//	daemonize = no;
+//	mdns_backend = avahi; // not used, not tested
+//	output_backend = alsa; // setting is not used, alsa is default
+//	port = 5000;
+//	password = "secret"; // default is no password needed
+//	interpolation = basic; // aka "stuffing". Default is basic, alternative is soxr
+//	statistics = no; // print statistics in the log
+//	tolerance = 88; // allow this number of frames of drift before correcting it
+//	resync_threshold = 2205; a synchronisation error greater than this will cause resynchronisation
+//	log_verbosity = 0; // "0" means no verbosity, "3" is highest.
+};
+
+latency =
+{
+//	default = 88200;
+//	itunes = 99400;
+//	airplay = 88200;
+//	forkedDaapd = 99400;
+};
+
+metadata =
+{
+//	metadata_feed_enabled = no;
+//	include_cover_art = no;
+//	metadata_pipe = "/tmp/shairport-sync-coverart";
+};
+
+sessioncontrol = 
+{
+//	run_before_play_begins = "/path/to/application";
+//	run_after_play_ends = "/path/to/application";
+//	wait_for_completion = no;
+//	allow_session_interruption = no;
+//	session_timeout = 120;
+};
+
+alsa =
+{
+//	device_type = software;
+//	device = "default";
+//	mixer = "default"; // default is that the device is also the mixer
+//	mixer_control_name = "PCM"
+};
+
+
+