Added preference for PolarView rotation

app/src/main/res/values/strings.xml

@@ -69,6 +69,8 @@
     <string name="pref_refresh_rate_key" translatable="false">rate</string>
     <string name="pref_refresh_rate_title">View refresh rate, ms</string>
     <string name="pref_refresh_rate_input_error">Set the value between 250ms and 10000ms</string>
+    <string name="pref_compass_key" translatable="false">compass</string>
+    <string name="pref_compass_title" translatable="false">Use sensors to rotate PolarView</string>
 
     <string name="no_mode">Mode: Null</string>
     <string name="no_uplink">Uplink: Null</string>

app/src/main/res/xml/preference.xml

@@ -45,5 +45,9 @@
             android:selectAllOnFocus="true"
             android:singleLine="true"
             android:title="@string/pref_refresh_rate_title" />
+        <SwitchPreference
+            android:defaultValue="false"
+            android:key="@string/pref_compass_key"
+            android:title="@string/pref_compass_title" />
     </PreferenceCategory>
 </PreferenceScreen>