Option for disabling the IME system

* It can be a user preference using the ULS Input method settings
* It can be a mediaWiki configuration $wgULSIMEEnabled

Change-Id: Ic5fb4932d62ab18db5d3b10ca81c0f6bfe9fd29e

UniversalLanguageSelector.php

@@ -56,6 +56,11 @@ $wgExtensionCredits['other'][] = array(
  */
 $wgULSGeoService = 'http://freegeoip.net/json/';
 
+/**
+ * IME system of ULS can be disabled by setting this value false;
+ */
+$wgULSIMEEnabled = true;
+
 /**
  * Try to use preferred interface language for anonymous users.
  * Do not use if you are caching anonymous page views without