ASCIIFoldingFilter: expose folding logic + small improvements to 
ISOLatin1AccentFilter
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                 Key: LUCENE-2015
                 URL: https://issues.apache.org/jira/browse/LUCENE-2015
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Analysis
            Reporter: Cédrik LIME
            Priority: Minor


This patch adds a couple of non-ascii chars to ISOLatin1AccentFilter (namely: 
left & right single quotation marks, en dash, em dash) which we very frequently 
encounter in our projects. I know that this class is now deprecated; this 
improvement is for legacy code that hasn't migrated yet.

It also enables easy access to the ascii folding technique use in 
ASCIIFoldingFilter for potential re-use in non-Lucene-related code.

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