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More refactorings. Commented out the plugin tests for now. They seem to wreak havoc with a lot of other tests (especially validator tests) and i havent found the reason yet.

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Added isValidModelClass() static method and fixed getLoadedModels() in order to resort back to the (classical) approach of class inclusion as a fallback when record classes have different names than their file names. The fallback behaviour of getLoadedModels() is now similar to what is was before the changes introduced in rev 3002.

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Makes it easier to see the dependencies between these two concerns, cache the results of the query parsing process later on, implement & use alternative hydrators to experiment with different algorithms etc. etc.
Other small refactorings.

- fixed typo  

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some small refactorings. adding docblocks. creating guard clauses. refactor our some code into methods. no aditional test failures so it looks ok. also added some @todo comments

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