FIX: Question marks are not parsed correctly

[tomek12311]

According to my understanding of the EDIFACT standard, a single ? before a special character (e.g., +, :, ') releases the character, meaning it no longer serves its usual role. Here’s a breakdown:

• ?' means the apostrophe is released and does not close the segment.
• ?? means the question mark itself is released as a literal character.
• ??? results in ? (released) followed by ?' (apostrophe released).
• ???? results in two released question marks (??) with no special meaning, so an apostrophe following them acts as a segment terminator.

The parser has been updated to correctly interpret these cases, ensuring segment terminators behave as expected based on the parity of preceding question marks.

Changes

1. Updated terminatorRegex in the parser
2. Added unit tests to verify the correct parsing of various sequences involving question marks

[sabas]

Merged, too many question marks in my head caused an overflow. rofl