Removed unused constraint package from kernel (ecore and code).

Issue-Ref: 3977
Issue-Url: https://af3-developer.fortiss.org/issues/3977



Signed-off-by: Andreas Bayha <bayha@fortiss.org>

This reverts commit ea0264b5.

Signed-off-by: Florian Hoelzl <hoelzl@fortiss.org>

Signed-off-by: Florian Hoelzl <hoelzl@fortiss.org>

Issue-Ref: 3376
Signed-off-by: Simon Barner <barner@fortiss.org>

Signed-off-by: Alexander Diewald <diewald@fortiss.org>

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- For reasons of consistency, and to avoid that "generated-src" directory is deleted by IDE dev tools' EcoreBuilder, start specification of directory for generated edit code with a '/' (just like the model, editor, and test code directories)
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- Add prefix "generated-" for directories of generated edit and editor code (not used in default AF3 distribution)

updated the ecore & genmodel models to Kepler (files are strucutrally identical but textually different, hence Eclipse was always displaying local differences)
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Big refactorings to make the library mechanism more generic. Tests are green and the simulator works.
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added ecore builder into kernel project
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