eventlogger module for ULS

Separating event logging out of ULS functionality. Event logging
is now loosely coupled with ULS. ULS core modules can emit an event
whenever EventLogging is required. The eventlogger module will act
on the event if configured.

Change-Id: I59dfcfb25c1acb85376b56239f2355ee7c4aff1e

resources/js/ext.uls.inputsettings.js

@@ -391,10 +391,7 @@
 
 			$moreLanguagesButton.on( 'click', function () {
 				inputSettings.$parent.hide();
-				mw.uls.logEvent( {
-					action: 'more-languages-access',
-					context: 'ime'
-				} );
+				mw.hook( 'mw.uls.ime.morelanguages' ).fire();
 			} );
 		},