Utiliy.filter alllows illegal JCR name characters
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                 Key: SLING-1878
                 URL: https://issues.apache.org/jira/browse/SLING-1878
             Project: Sling
          Issue Type: Bug
          Components: Commons
    Affects Versions: Extensions Event 2.4.2
            Reporter: Felix Meschberger
            Assignee: Felix Meschberger
             Fix For: Extensions Event 3.0.0


The Utility.filter method is used to filter strings for a subset characters 
used for creating node names to persist events in the repository. Yet, the list 
of legal characters includes illegal characters like the brackets "[", "]" and 
the asterisk "*".

In addition the implementation is suboptimal in that it uses the String.indexOf 
method to check for legal characters. This can be improved by using a BitSet 
where the accepted characters are represented by bits turned on.

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