Initial JUnit tests for SQL Developer Extension

[PhilippSalvisberg]

Create JUnit tests for SQL Developer Extension.

Cannot use use utPLSQL since the code to be tested is in XML files. Easier to extract relevant SQL and PL/SQL Code and run it in JUnit and integrate it in existing Maven build.

Add the project to the CI server.

[PhilippSalvisberg]

closed via efca7e3