Add a multiple choice match list macro.

[drgrice1]

The parserMatchList.pl macro is intended to replace the PGchoicemacros.pl match list (obtained via new_match_list). This is the only thing left from the PGchoicemacros.pl that has not yet been replaced with a modern MathObject equivalent.

The MatchList object derives from a Value::List and is an ans_array type answer. So it is inserted into PGML with the [_]*{...} syntax, and if a custom checker is desired the list_checker is needed.

This macro is similar in nature to the parserPopUp.pl and parserCheckboxList.pl macros in many ways, and actually uses the parserPopUp.pl DropDown object internally. As with the objects from those macros, this MatchList object can be used as a part answer in a MultiAnswer or RadioMultiAnswer.

The tutorial/sample-problems/Misc/Matching.pg has been replaced with the tutorial/sample-problems/Misc/MatchList.pg problem. The tutorial/sample-problems/Misc/MatchingAlt.pg has also been removed, since that approach is better accomplished with the parserMatchList.pl macro.

There are unit tests for the macro in t/macros/parserMatchList.t.

Note that the PTX output will need verification (and probably modification). Claude added something for that, but I don't know what it is correct.

Here are some problems that demonstrate some other uses of the macro that are different than the sample problem:
MatchList.zip

[drgrice1]

The attached example problems include problems that use a MatchList in a MultiAnswer and RadioMultiAnswer, and the examples have custom checkers. I wanted to point out that the default MultiAnswer and RadioMultiAnswer checkers do work. The examples just demonstrate how you would do things in a custom checker.