android: remove MapActivity

- see vtm-android-start for an example use of MapView
- add MapPreferences

- update android-start
- android-example: use appcompat actionbar

vtm-android-example/AndroidManifest.xml

@@ -15,8 +15,8 @@
   <application
     android:allowBackup="true"
     android:icon="@drawable/ic_launcher"
-    android:label="@string/app_name">
-    <!-- android:theme="@style/AppTheme" -->
+    android:label="@string/app_name"
+    android:theme="@style/AppTheme" >
     <activity
       android:name="org.oscim.android.test.Samples"
       android:label="@string/app_name" >