Fixed bug(s) in evalBin
Equivalence class tests also use the QuickCheck module now.
Added a "run mode" to Main.hs (Debug / Release). In case of Debug, the results of QuickCheck and Z3 will be compared (and an error will be thrown if they have different results). In Release mode, this doesn’t happen.

Refactored Test code to work with Z3 code.
Integrated Test module in Server code.

Some cleanup, added null check functionality on arrays. Test.hs correctly tests all 16 examples now.

Implemented Wishnu’s idea for quantifier evaluation in the Test module, since that’s definitely a better idea on second thought. However, performance with complete randomness is absolutely terrible now, so that problem needs to be addressed next.

- Fixed bug that caused extractExpr to crash when it tried to fetch all pre / post conditions of a method that doesn’t have any.
- Increased the number of iterations in the tenth LogicIR.Backend.Test test.

Renamed QuickCheck to Test everywhere, since QuickCheck isn’t even used in the automated testing module.

- Added correct handling of LIsnull in QuickCheck.
- Fixed a bug in Rewrite.hs that wasn’t causing issues yet, but was a bug nonetheless.
- Sped up QuickCheck tests by making the number of iterations dependent on the specific test.