Migrate audio menu logic to appmenu and add indicator for current out device

scripts/core/sxmo_audioout.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env sh
+ARG="$1"
+
+SPEAKER="Line Out"
+HEADPHONE="Headphone"
+EARPIECE="Earpiece"
+
+amixer set "$SPEAKER" mute
+amixer set "$HEADPHONE" mute
+amixer set "$EARPIECE" mute
+
+if [[ "$ARG" = "Speaker" ]]; then
+  amixer set "$SPEAKER" unmute
+elif [[ "$ARG" = "Headphones" ]]; then
+  amixer set "$HEADPHONE" unmute
+elif [[ "$ARG" = "Earpiece" ]]; then
+  amixer set "$EARPIECE" unmute
+fi
+
+echo 1 > /tmp/sxmo_bar