[BUG/Core/Feature] Add CORS-Everywhere Headers

[Stridsvagn69420]

In order to serve Azura-Web, I finally got to know how to do CORS correctly, I think.

Both the requested resource and the website need to have these Access-Control headers in order to work:
Access-Control-Allow-Origin: * Access-Control-Allow-Methods: GET, HEAD

[Stridsvagn69420]

also add OPTIONS for the allowed methods