Support `not in` operator

[cirras]

Prerequisites

• This improvement has not already been suggested.
• This improvement would be generally useful, not specific to my code or setup.

Engine area

Delphi language support

Improvement description

Delphi 13 has introduced a new not in operator.

This might require some extra care to ensure operator precedence is respected properly.

Example

if not (x in [Apple, Orange] then ... // classic syntax
if x not in [Apple, Orange] then ... // new syntax

See

• The is not and not in Operators
• Operator Precedence

Rationale

Delphi 13 support.