move to junit 5

At the moment we have a mixture of JUnit 4 and JUnit 5 tests.

We want to completely move to JUnit 5.

For this, a new branch was introduced: [move-to-junit5]. Be aware that I removed JUnit 4 completely there, so a lot of compile errors are still there.

Sadly it is not enough to replace the imports:

1. replace imports
2. change assertions with messages: in junit 4 the message was the first parameter in junit 5 its the last
3. change annotation names before, after, … those are renamed in junit 5

I will start from the bottom to change the stuff (now TableNamesFinderTest.java)

To clean things up:

1. remove empty generated before and after methods

[wumpz]

@manticore-projects I thought about that as well but decided against it, at least for all those simple SQL parsing tests, since you would e.g. loose the documentation, method naming, context. Or do you have something different in mind?

[wumpz]

merge is done