android: handle android STREAM_MUSIC volume level forwarding

emit android STREAM_MUSIC volume when it arrives.

Author: thyttan

apps/android/lib.js

@@ -44,6 +44,10 @@ exports.gbHandler = (event) => {
     "musicinfo" : function() {
       require("messages").pushMessage(Object.assign(event, {t:"modify",id:"music",title:"Music"}));
     },
+    // {t:"audio", v:(percentage of max volume for android STREAM_MUSIC)}
+    "audio" : function() {
+      Bangle.emit("musicVolume", event.v);
+    },
     // {"t":"call","cmd":"incoming/end/start/outgoing","name":"Bob","number":"12421312"})
     "call" : function() {
       Object.assign(event, {
@@ -386,4 +390,4 @@ exports.overwriteGPS = () => { // if the overwrite option is set, call this on i
   setTimeout(()=>{
     if (!Bangle.isGPSOn()) require("android").gbSend({ t: "gps_power", status: false });
   },3000);
-};
+};