Some much needed HTTP adjustments

The ANY method (App::any) will now properly match with all possible HTTP methods, not just all of the standard ones. This is needed to properly implement your own (reliable) 404 page, or to reliably route all traffic to some common handler (what Bun does).

A slight behavioral change was needed:

• Matching is now ordered by method first, URL second. This means that, for instance, a match with static method and parameter URL will match before an ANY method with static URL. This is very similar to previous behavior, but more easy to understand and simpler to implement.

This behavioral change should be practically unnoticeable.

More:

• Adds the environment variable UWS_HTTP_MAX_HEADERS_SIZE for controlling maximum (total) HTTP header size allowed. Default is 4kb.
• Adjusts the default maximum header count allowed, raised from 50 to 100 and controlled explicitly via added compiler define UWS_HTTP_MAX_HEADERS_COUNT.