Adding unit tests to launcher where applicable

[GeckoEidechse]

Discussion taken from this #Verified mods #research thread

CTest was suggest but according to @Jan200101 it can only really deal with cmake concepts, e.g. checking if a binary outputs the correct contents to stdout:

Popular C++ Unit Test frameworks include:

• GTest
• Catch2
• Boost.Test

Personally I prefer Catch2