upgrade to schemacrawler 16.x

[robokaso]

I have created an experimental branch compatible with the up-to-date schemacrawler version 16.x. It manages to run our private test suite successfully, however it introduces subtle backwards incompatibility of the generated classes (I'm not sure if it is feasible to avoid this).

The undesired change is detected by failing CodeGeneratorTest pointing to an unexpected serializedTableModel value and in practice I noticed it manifests as different ordering of arguments in generated methods (e.g. RedG.addUserRoleAssignment(User, Role) vs RedG.addUserRoleAssignment(Role, User))

If anybody finds this useful the code is available here: https://github.com/robokaso/redg/tree/schemacrawler16