Refactoring / documentation / test of matcher package
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                 Key: IVY-375
                 URL: https://issues.apache.org/jira/browse/IVY-375
             Project: Ivy
          Issue Type: Improvement
          Components: Core
    Affects Versions: 1.4.1
            Reporter: Stephane Bailliez
            Priority: Trivial
         Attachments: matcher-src.patch

Objective was to cleanup slightly the code by documenting the exact intent of 
the interface and methods to provide a consistent implementation. 
Implementation has been adjusted to match it:
- Does not support null input
- Does not support null expression
- Remove getInstance() method in favor of INSTANCE public static final field.
- Remove unused method
- Javadoc documentation where appropriate (it's not full-fledged, but eh.. Rome 
was not made in a day 
- Added testcases for all pattern matchers
- Added // TODO notes for long-term mental notes

The change is overall minor and have little impact to the rest of the code.
I expect some slight API adjustements later on but this is enough for now.

Let me know if there are issues and if I forgot something in the patches.

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