Fix assertion when requesting URL containing ':' from serveStaticFiles.

Paths containing a colon were considered to be Windows absolute
paths, causing Path.opBinary!("~") to assert. Now, the request is
just ignored (causing a 404 to be gennerated).
Merge pull request #694 from klickverbot/url-colon-crash

Fix assertion when requesting URL containing ':' from serveStaticFiles.
Fix bogus "no route match" debug message for the match tree based URLRouter.
Recognize "application/javascript" for the script text block deprecation path.
Properly support boolean parameters for vibe.web.web.
Fix vibe.web.web language detection for matches with no country suffix.