Implement FOR NEXT #29
Description
Alternative Loop Structure FOR ... NEXT
http://www.bellgroup.cz/private/?p=1934
https://github.com/TG9541/stm8ef/wiki/eForth-FOR-..-NEXT
https://old.reddit.com/r/Forth/comments/6b9lsz/alternatives_to_loop/
http://brokestream.com/daf.txt
https://stackoverflow.com/questions/6949434/how-to-implement-loop-in-a-forth-like-language-interpreter-written-in-c
https://web.archive.org/web/20140406021653/http://blogs.msdn.com/b/ashleyf/archive/2011/02/06/loopty-do-i-loop.aspx