List API (G1CMZ): List Processing API

[StephenG1CMZ]

Pier4r, no ListAPI does not include ListExt or goferlist.

There are some functions that duplicate those in ListExt, such as removing duplicates from lists, but many more in Listext with no equivalent in ListAPI - and I have made no attempt to keep names the same.
I can see that adding some more functions and using consistent names could be useful.

As for goferlist, the .doc files I have found are not readable on my Android.