FIX #3868 Upgraded ckeditor to 4.5.6

COPYRIGHT

composer.json

composer.lock

htdocs/includes/ckeditor/ckeditor/CHANGES.md

htdocs/includes/ckeditor/ckeditor/LICENSE.md

htdocs/includes/ckeditor/ckeditor/adapters/jquery.js

htdocs/includes/ckeditor/ckeditor/bower.json

htdocs/includes/ckeditor/ckeditor/build-config.js

htdocs/includes/ckeditor/ckeditor/ckeditor.js

htdocs/includes/ckeditor/ckeditor/config.js

htdocs/includes/ckeditor/ckeditor/contents.css

htdocs/includes/ckeditor/ckeditor/lang/af.js

htdocs/includes/ckeditor/ckeditor/lang/ar.js

htdocs/includes/ckeditor/ckeditor/lang/bg.js

htdocs/includes/ckeditor/ckeditor/lang/bn.js

htdocs/includes/ckeditor/ckeditor/lang/bs.js

htdocs/includes/ckeditor/ckeditor/lang/ca.js

htdocs/includes/ckeditor/ckeditor/lang/cs.js

htdocs/includes/ckeditor/ckeditor/lang/cy.js

htdocs/includes/ckeditor/ckeditor/lang/da.js