(find_charsets_in_charc_string): New function; delete

(find_charsets_in_charc_string): New function; delete
`find_charsets_in_emchar_string'.
(charc_string_displayed_columns): New function; delete
`emchar_string_displayed_columns'.
(convert_bufbyte_string_into_charc_dynarr): New function; delete
`convert_bufbyte_string_into_emchar_dynarr'.
(convert_charc_string_into_bufbyte_dynarr): New function; delete
`convert_charc_string_into_bufbyte_dynarr'.
(convert_charc_string_into_malloced_string): New function; delete
`convert_charc_string_into_malloced_string'.