allow length operator in macroprocessor to return the length of strings

At present, the length operator applied to a string always returns 1.

It would be good if it returned the length of the string.

Try e.g.:

@#define Numbers = [ "1", "2", "3", "4", "5", "6" ]
@#define TestString = "Hello"
@#echo Numbers[ length( TestString ) ]

parameters a;
a = 1;

Incidentally, it would be good if there was a number to string function in the pre-processor!