Issue #2203435 by sun: Move all external libraries from core modules into core.libraries.yml.

core/assets/vendor/jquery-joyride/joyride-2.0.3.css

core/assets/vendor/jquery-joyride/jquery.joyride-2.0.3.js

core/assets/vendor/picturefill/picturefill.js

core/core.libraries.yml

.../picture/Plugin/Field/FieldFormatter/PictureFormatter.php

core/modules/picture/picture.libraries.yml

core/modules/tour/tour.libraries.yml