Modify scripts that generates files for unit tests

[end2endzone]

The code for generating unit tests files is split into a Batch file and a Shell script for Windows and Linux builds.

Having two different scripts is hard to maintain. The scripts should be merged into a single c++ executable or a python app. This would simplify the code for generating files.

How and when files are generated in also pretty confusing when looking at cmake projects. This would also need simplification.