TRIM arguments per COBOL2023 are missing

[GitMensch]

if you adjust something there, then make it compatible to COBOL2023.

(that is not 100% correct, the "..." applies to both argument-2 and ANYCASE together.

• argument-2 may specify the character to trim (and ANYCASE if that character is case-insensitive)
• that group can be specified multiple times
• as explanation, not relevant for the LSP [if it isn't specified it implies a single group consisting of SPACE]

NOTE The processing of TRIM (arg-1 arg-2-1 arg-2-2) is the same as TRIM (TRIM (arg-1 arg-2-1) arg-2-2). If
the TRIM (“aabbcc” “c” “b”) is specified, the result would be “aa”, not “aab” or “aabb”.

Originally posted by @GitMensch in #209 (comment)

While #262 implemented the COBOL2014 addition, the addition from COBOL2023 is missing.