Changed Rest-Calls to new API,

Many bugfixes and some improvements (especially on the map),
Some minor design changes,
Removed MainActivity from Menu

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

@@ -3,7 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <item android:id="@+id/menu_btn_gotostart"
-        android:icon="@android:drawable/ic_menu_revert"
+        android:icon="@android:drawable/ic_input_delete"
         app:showAsAction="always"
         android:title="@string/lbl_reportwf_newreport" />