Support base64url encoding.

* filter.c (tobase64url_k, frombase64url_k): New keyword
symbols variables.
(base64_stream_enc_impl): New static function, derived from
base64_stream_enc.
(base64_stream_enc): Now a wrapper for base64_stream_enc_impl.
(base64url_stream_enc, base64url_encode): New functions.
(base64_stream_dec_impl): New static function, derived from
base64_stream_dec.
(base64-stream_dec): Now a wrapper for base64_stream_dec_impl.
(get_base64_url_char, b64url_code): New static functions.
(base64url_stream_dec, base64_url_decode,
base64url_decode_buf): New functions.
(filter_init): Intern new keyword symbols, initializing the
corresponding variables, register new :frombase64url
and :tobase64url filters and intrinsic functions
base64url-stream-enc, base64url-stream-dec, base64url-encode,
base64url-decode and base64url-decode-buf.

* filter.h (base64url_stream_enc, base64url_stream_dec,
base64url_encode, base64url_decode, base64url_decode_buf):
Declared.

* txr.1: Documented.

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