Move private unit-tests into the public repository

[andrivet]

• [X] This issue is NOT about support.

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Feature Request

• [X] Your request is not specific to your setup but can benefit to many people
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• [X] You have provided a short but meaningful title
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Detailed description of the feature request:

Currently, I have some unit-tests (using Boost.Test) for some of the classes in the project (mainly, the DGUS part). These tests are in a separate private project. The goals of this enhancement are:

• Move the unit-tests into the public repository
• Use Catch2 instead of Boost.Test as I am now using Catch2 for my other projects
• Unit-test more parts of the project, like the new ADVString as I know it has bugs

[andrivet]

The unit tests are under "Unit-Tests" in the sources. To execute the tests, build the project and simply execute Unit_Tests.