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

scripts/core/sxmo_audiooutmenu.sh

@@ -1,27 +0,0 @@
-#!/usr/bin/env sh
-OUTINPUT="$(
-echo "Speaker
-Headphones
-Earpiece
-Close Menu" | dmenu -p "Audio Out" -c -fn "Terminus-30" -l 20
-)"
-
-[[ "Close Menu" == "$OUTINPUT" ]] && exit 0
-
-SPEAKER="Line Out"
-HEADPHONE="Headphone"
-EARPIECE="Earpiece"
-
-amixer set "$SPEAKER" mute
-amixer set "$HEADPHONE" mute
-amixer set "$EARPIECE" mute
-
-if [[ "$OUTINPUT" = "Speaker" ]]; then
-  amixer set "$SPEAKER" unmute
-elif [[ "$OUTINPUT" = "Headphones" ]]; then
-  amixer set "$HEADPHONE" unmute
-elif [[ "$OUTINPUT" = "Earpiece" ]]; then
-  amixer set "$EARPIECE" unmute
-fi
-
-echo 1 > /tmp/sxmo_bar