DDC-1266 - Fixed bug where one sequence is dropped multiple times and extended that logic to tables and constraints

Fix bug with empty or null host connection parameter in Oracle DSN construction

DDC-217 - Refactor result caching to use a value object for all the important information which simplifies the code considerably and makes caching more powerful.

DDC-217 - Refactor result cache again to be much simpler, previous approach was too complicated and something like this needs longer testing. Now only caching the full result.

DDC-217 - Add Result Cache feature

Fix bug where empty or null host connection parameter will still construct an Oracle DSN instead of using dbname.