Merge branch 'REL1_35' into master

• REL1_35: Set $wgHtml5 to true for JavascriptSlideshow Add Video Extension (T5906) (#3317) Remove CrossReference (#3320) Add SimpleBlogPage ext (#3316) wgCreateWikiSQLfiles: Update sql location for 1.35 Update path of sql files (#3291) Fix syntax Update LocalSettings.php Replace deprecated hook SkinTemplateOutputPageBeforeExec with SkinAddFooterLinks (#3308) Switch SubpageFun to extension registration (#3307) Switch MassEditRegex to Extension Registration (#3306) WBL_VERSION constant was removed, replace with wgVersion (#3304) Update wgPasswordPolicy to be compatible with 1.35 (#3303) Properly migrate config for 1.35 support part 1 (#3301)