Multiple improvements to the URI class

(thanks to @sourcejedi, PR #1326 for most of the ideas)

 - Renamed _detect_uri() and _parse_cli_args() to _parse_request_uri() and _parse_argv() respectively.
 - Added _parse_query_string() which allows us to detect the URI path from QUERY_STRING much like it is done in _parse_request_uri().

(the above changes also allow for a simpler logic in the case where the *uri_protocol* setting is not set to 'AUTO')

 - Updated application/config/config.php with a better list of the *uri_protocol* options.
 - Added _reset_query_string() to aid in re-processing  from the QUERY_STRING (utilized in _parse_request_uri() and _parse_query_string()).

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