Map '.aspx' file extension to 'text/html'

 * login.live.com serves some pages with aspx extension and no mimetype.
 * Without this, they would be downloaded instead of shown in browser.
BUrlProtocolHandler: sync with Haiku API changes

 * Better relative URL support, custom HTTP methods
 * Some more fixes and remove debug traces.
Cookie Jar: remove now unused hash map storage
Fix memory leak.
Remove useless code

 * When FindBRect fails, it already sets an invalid rect
 * This also fixes a crash, but I'm not sure what was wrong.