Port urldb to nsurl. Won't build since rest of NS needs ported to new urldb API.

+ urldb API now takes URLs as nsurl, rather than string.
+ urldb internally stores full URLs with nsurl ref.
+ urldb internally stores schemes as lwc_string.
+ Load and save of cookies and URL file may be slower since
  we now need to create a nsurl.
+ Everything else should be faster, and there should be much
  less allocating/freeing and much less parsing of the same
  url over and over again.
+ Updated urldbtest for new urldb API.
+ urldbtest now cleans up at the end
+ Added lwc_string itterator to end of urldbtest
+ Adding some broken URLs (such as http:domain/) will now
  work, since nsurl fixes (http://domain/) them.

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