Provide looser coupling of PatternConverters
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                 Key: LOG4J2-19
                 URL: https://issues.apache.org/jira/browse/LOG4J2-19
             Project: Log4j 2
          Issue Type: Improvement
          Components: Layouts
            Reporter: Ralph Goers


Currently, PatternLayout calls PatternParser which knows about the various 
PatternConverters, many of which are imbedded in it. This makes it difficult 
for users to add their own Converters. 
In the logging framework I created each converter identified the conversion 
characters it supported. Each PatternConverter was required to supply a 
getKeys() method that returned this list. The equivalent of the PatternLayout 
contained an array of PatternConverters. During initialization each of these 
would be called and the list of keys recorded along with the associated 
converter. To add your own converter all that was necessary was to extend the 
class and add your new keys to the list of recorded keys along with their 
converters. The base PatternLayout would then take care of calling the correct 
converters as necessary.

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