Add more tests

[qzed]

List of untested (<=> no extra test cases) stuff:

• microtrafficsim.core.vis.opengl.utils.Colorneeds test cases for inversion
• crossing logic indices
• Determinism
• many util-classes like WheelOfFortune
• QuadTreeTilingScheme
• circle street: test crossing indices/crossing logic if a street is entering/leaving a crossroad multiple times
• Route serialization: compare before and after
• SortedArrayList, FastSortedArrayList

[qzed]

This includes fixing/updating existing tests.