Add file encoding.[ch] and add method File::set-encoding, File::set-input-encoding and File::set-output-encoding. Add symbol ErrNoEncoding.
Add file encoding.[ch]
and add method File::set-encoding, File::set-input-encoding and File::set-output-encoding.
Add symbol ErrNoEncoding.

mitchan0321/perfume,mitchan0321/perfume,mitchan0321/perfume,mitchan0321/perfume,mitchan0321/perfume