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.displaysettings.js

@@ -159,18 +159,17 @@
 				new mw.Api().parse( $.i18n( 'ext-uls-display-settings-anon-log-in-cta' ) )
 					.done( function ( parsedCta ) {
 						$loginCta.html( parsedCta );
-						// Because browsers navigate away when clicking a link,
-						// we are are overriding the normal click behavior to
-						// allow the event be logged first - currently there is no
-						// local queue for events. The timeout is there to make sure
-						// the user gets to the new page even if event logging is slow
-						// or fails.
 						$loginCta.find( 'a' ).click( function ( event ) {
 							event.preventDefault();
-							mw.uls.logEvent( { action: 'login-click' }, 500 )
-								.always( function () {
-									window.location.href = event.target.href;
-								} );
+							// Because browsers navigate away when clicking a link,
+							// we are are overriding the normal click behavior to
+							// allow the event be logged first - currently there is no
+							// local queue for events. The timeout is there to make sure
+							// the user gets to the new page even if event logging is slow
+							// or fails.
+							mw.hook( 'mw.uls.login.click' ).fire( function () {
+								window.location.href = event.target.href;
+							} );
 						} );
 					} );
 
@@ -323,10 +322,7 @@
 
 			$moreLanguagesButton.on( 'click', function () {
 				displaySettings.$parent.hide();
-				mw.uls.logEvent( {
-					action: 'more-languages-access',
-					context: 'interface'
-				} );
+				mw.hook( 'mw.uls.interface.morelanguages' ).fire();
 			} );
 		},