[TYPO3-core] RFC #9879: enable charlist for trim function in stdWrap

[Georg Ringer]

This is a SVN patch request.

Type: Feature
Bugtracker Reference: http://bugs.typo3.org/view.php?id=9879

Branch: trunk

Problem:
The trim function of stdwrap is limited to whitespaces but it would be 
very nice to be able to trim any other char too, e.g. a , or whatsoever

Solution:
Set a new option charList to define the chars which should get trimmed too.

Notes:
- IMO this is a no-brainer
- Don't know if the wording is ok for you, so I will add the changes for 
the pending doku changes after some answers

Georg
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