Major updates to drawer header layout. Added extension methods for doubles in shared preferences. Code cleanup.

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

@@ -12,10 +12,6 @@
             android:title="@string/menu_map" />
     </group>
 
-    <item
-        android:id="@+id/nav_settings"
-        android:title="@string/menu_settings" />
-
     <item android:title="@string/menu_about">
         <menu>
             <item

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

@@ -1,9 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
-
-    <item
-        android:id="@+id/update_location"
-        android:title="@string/menu_update_location" />
     <item
         android:id="@+id/fetch_trans"
         android:title="@string/menu_fetch_transmitters" />