Better support for non-Emery watches; initial PKJS prep

package.json

@@ -36,12 +36,12 @@
       "watchface": false
     },
     "messageKeys": [
-        "IN_CURRENT_LEVEL",
+        "PKJS_READY",
         "IN_VANITY_LIST",
         "IN_ID_LIST",
+        "OUT_MENU_NAV_SCOPE",
         "OUT_TRACK_ID",
-        "OUT_PLAYBACK_MODE",
-        "OUT_PLAYBACK_ACTION"
+        "OUT_SHUFFLE_MODE"
     ],
     "resources": {
       "media": [