[Framework] Try to improve performance of parseDelimitedString() in manifest 
parser
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                 Key: FELIX-2804
                 URL: https://issues.apache.org/jira/browse/FELIX-2804
             Project: Felix
          Issue Type: Improvement
          Components: Framework
    Affects Versions: framework-3.0.7
            Reporter: Richard S. Hall
            Priority: Minor
             Fix For: framework-3.2.0


Currently, we are using StringBuffer and appending one character at a time 
while parsing a delimited string. As we discovered when implementing our custom 
manifest parser, such an approach is not really very efficient. It is better to 
keep track of beginning/ending indexes and just extracting strings as needed. 
We should probably do something similar here. It may not offer great 
improvement, but this routine is used to parse pretty long import/export 
headers, so you never know.

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