[uri] Decode/encode URIs when parsing/unparsing

Currently, handling of URI escapes is ad-hoc; escaped strings are
stored as-is in the URI structure, and it is up to the individual
protocol to unescape as necessary. This is error-prone and expensive
in terms of code size. Modify this behavior by unescaping in
parse_uri() and escaping in unparse_uri() those fields that typically
handle URI escapes (hostname, user, password, path, query, fragment),
and allowing unparse_uri() to accept a subset of fields to print so
it can be easily used to generate e.g. the escaped HTTP path?query
request.

Signed-off-by: Joshua Oreman <oremanj@rwcr.net>
Signed-off-by: Marty Connor <mdc@etherboot.org>

src/core/settings.c

@@ -1085,7 +1085,7 @@ static int fetchf_uristring ( struct settings *settings,
        
 		fetch_string_setting ( settings, setting, raw_buf,
 				       sizeof ( raw_buf ) );
-		return uri_encode ( raw_buf, buf, len );
+		return uri_encode ( raw_buf, buf, len, URI_FRAGMENT );
 	}
 }