[2.0] Refactored cache drivers. Made use of ArrayCache as the metadata cache during a test suite run.

DQL Parser work. Getting some first tests back running. Reorganizing all parser rules into the Parser itself.

First tests for basic collection implementation. First experimental use of closures (Currently commented out, because the svn server makes a syntax check against 5.2.x).

added missing annotation driver class. small refactorings. added first ClassMetadata serialization tests.

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