make default base64 config ignore newline (and maybe also leading/trailing whitespaces) characters

[haochenx]

方針

Default config について

https://github.com/kxcteam/kxclib-ocaml/blob/ce6cf01df256cff329b28e52b8dc2a9eb8e72cb9/kxclib.ml#L2730
の代りに、

module Config_rfc4648_relaxed = struct
  include Config_rfc4648
  let ignore_newline = true
end

を用意して、代りにこちらを include Make(Config_rfc4648_relaxed) しましょう

newline/whitespace config について

現在の ignore_newline https://github.com/kxcteam/kxclib-ocaml/blob/ce6cf01df256cff329b28e52b8dc2a9eb8e72cb9/kxclib.ml#L2496-L2497 のかわりに、

(** white spaces : SP, LF, CR, HT, VT, FF;
     line breaks : LF, CR;

    NB that if [ignore_unknown] is set to true, then all white space characters are
    automatically ignored *)
val ignore_whitespace : [
  | `newlines_only (** only ignore LF and/or CR and white spaces immediately following *)
  | `all_white_spaces (** ignore all white spaces *)
] option;

[kxc-ryfujis]

how about adding ignore_whitespaces config?

note: https://v2.ocaml.org/api/String.html#VALtrim

Whitespace characters are: ' ', '\x0C' (form feed), '\n', '\r', and '\t'.