* NEW Make resources dir configurable.
* Removing reference to old `resources` and updating doc #8519
* Rrtarget to 4.4 release.
* DOC Reference SS_RESOURCES_DIR in Environment doc.
* API Add a Resources method to SilverStripe\Core\Manifest\Module to read the resources-dir from composer.json
* Clean up reference to SS_RESOURCES_DIR env var
* Set default resources-dir
* Update test to use RESOURCES_DIR const in expected resource url method
* Correcting typos
Co-Authored-By: maxime-rainville <maxime@rainville.me>
* MINOR Correctubg minor typos
* DOCS Document the intricacies of exposing static assets.
`SimpleResourceURLGenerator` has been altered to allow absolute URLs to be loaded directly, as so is now also tested to ensure the added functionality is true to design.
