[PeyloW]

Completed the centralised argument handling. All predefined functions now use evalArgs to validate arguments and evaluate them as needed. EvalArgs take a regexp-lookalike format string with arguments, the original list of unevaluated arguments and optionally a dynamic array of integers to fill with counts if using variable count of arguments. The return value is the evaluated arguments as a new list, or an exception if something goes wrong.

Some better error-reporting would be nice, but the code in evalpredefs.d should go down by half. And is much more future proof.