Initial support for webfonts in MobileFrontend

Written in pair-programming with Ryan Kaldari.

This adds a version of webfonts initialization that is stripped
of any smart features. It only loads the basic jquery.webfonts
library and the fonts repository in a way that is usable
with the MobileFronted extension.

It is completely disabled by default.

It can be enabled by setting
$wgULSMobileWebfontsEnabled = true;
and even then it will only be enabled for users
who opted in for the mobile beta mode.

Change-Id: I488e411232a1192bbf46ae5675c701366bda9a3e

UniversalLanguageSelector.php

@@ -104,6 +104,12 @@ $wgULSLanguageDetection = true;
  */
 $wgULSIMEEnabled = true;
 
+/**
+ * Set whether webfont support is loaded within the mobile interface (via the
+ * MobileFrontend extension).
+ */
+$wgULSMobileWebfontsEnabled = false;
+
 /**
  * The location and the form of the language selection trigger.
  * The possible values are:
@@ -184,6 +190,7 @@ $wgAPIModules['ulslocalization'] = 'ApiULSLocalization';
 $wgHooks['UserGetLanguageObject'][] = 'UniversalLanguageSelectorHooks::getLanguage';
 $wgHooks['SkinTemplateOutputPageBeforeExec'][] =
 	'UniversalLanguageSelectorHooks::onSkinTemplateOutputPageBeforeExec';
+$wgHooks['EnterMobileMode'][] = 'UniversalLanguageSelectorHooks::onEnterMobileMode';
 
 $wgDefaultUserOptions['uls-preferences'] = '';
 $wgHooks['GetPreferences'][] = 'UniversalLanguageSelectorHooks::onGetPreferences';