Move all wrappers under same package
Move all loaders under the same package
Move assets request context under web package
Implements the Cacheable Location Wrapper for assets stack feature

A Cacheable Location Wrapper transform the location into a content (js, css, ...) and store it into a cache.

use by classpath, delegate, template and webjars location wrappers.
wording to reflect the method usage
update thymeleaf on dandelion dialect