[concept] Simplify tupleEntriesModel()

This helper allows to check if all entries from a tuple model a concept. The patch simplifes the check and reduces the dependencies: We no longer depend on tupleutility.hh which is pretty heavy weight since in includes hybridutilities.hh and rangeutilities.hh. Thus emulated concepts could not be used in these headers so far, which is fixed by the patch.

To prevent a regression this also adds a test for the previously untestet function.