Better testing - integration and unit tests, revive old tests

[leandor]

In the original SVN repository (cloned here, for now) there were some files on the release folder that ran some test suit on the compiled CBash.dll

• https://github.com/leandor/CBashSF/blob/master/release/ObTest.py
• https://github.com/leandor/CBashSF/blob/master/release/FNVTest.py

Maybe split those into atomic tests and run them all in sequence, at least for those ones that make sense to automate.

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TODO

• [ ] Recover NewVegas tests from sourceforge (need to think proper directory structure for handling several games tests)
• [ ] Split big ObTest.py into atomic tests.
• [ ] Convert tests to unit-tests which rely on check premises and fail.
• [ ] Refactor tests to not depend on Oblivion.esm (generally, on any <game>.esm), by recreating a file that contains the proper records needed for each test.
• [ ] Alternatively, if present, detect game and copy master file to test directory as part of the startup code.

[leandor]

The tests were added to branch leandor-wip in commit 2cc9ed9991beb10136de857a58772dea01a125e3