- new implementation of messaging

- fixed possible crash when messages arrive before accounts are created
- other minor fixes and improvements

app/src/main/res/menu/call_icon.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <item
+        android:id="@+id/callIcon"
+        android:title=""
+        app:showAsAction="always"
+        android:icon="@drawable/ic_action_call"
+        />
+
+</menu>