add ServerURL preference (replaces address, port, encryption)

app/src/main/res/xml/preferences.xml

@@ -13,24 +13,10 @@
         android:title="@string/settings_id_title" />
 
     <EditTextPreference
-        android:defaultValue="demo.traccar.org"
-        android:key="address"
-        android:summary="@string/settings_address_summary"
-        android:title="@string/settings_address_title" />
-
-    <EditTextPreference
-        android:defaultValue="5055"
-        android:key="port"
-        android:numeric="integer"
-        android:summary="@string/settings_port_summary"
-        android:title="@string/settings_port_title" />
-
-    <CheckBoxPreference
-        android:defaultValue="false"
-        android:key="secure"
-        android:summaryOff="@string/settings_secure_off_summary"
-        android:summaryOn="@string/settings_secure_on_summary"
-        android:title="@string/settings_secure_title" />
+        android:defaultValue="@string/settings_url_default_value"
+        android:key="url"
+        android:summary="@string/settings_url_summary"
+        android:title="@string/settings_url_title" />
 
     <EditTextPreference
         android:defaultValue="300"