[expression] implement a wordwrap function (feature request #9412)
[expression] more work on wordwrap function based on wonder-dk comments
[expression] add wordwrap function help file
[expression] rework the wordwrap to allow for maximum / minimum line length to wrap, fix test and add two more
[expression] made wordwrap delimiter string an optional 3rd argument
[expression] fix function help following argument ordering shift
[expression] check for maximum nb of arguments in wordwrap function
Merge pull request #1208 from nirvn/expression_wordwrap3

[expression] implement a wordwrap function (fix #9412)