url encoding rfc 3986 conformance

I'd like to update, or at a minimum, add an option for rawurlencode to output rfc3986 conforming data. It basically boils down to just also not encoding the "~" character. Most of the new technologies doing encoding require this and its becoming a pita to write exception code for that one character. Personally I think the function should just be updated for 3986 compliance rather than adding any parameter flags. simple change in url.c

-                       (str[y] > 'z')) {
+                       (str[y] > 'z' && str[y] != '~')) {

possibly updating urlencode as well to keep them working similarly Rob