Define test projects for unit tests

[drahnr]

• [ ] cargo
• [ ] conan
• [ ] cmake
• [ ] ninja
• [ ] waf

covering the following compilers

• [ ] rust +nightly
• [ ] rust +stable
• [ ] clang
• [ ] gcc
• [ ] nvcc

which have to link

• [ ] static
• [ ] dynamic

targeting a target that is itself

• [ ] bin dynamic
• [ ] bin static
• [ ] lib dynamic
• [ ] lib static

**Note that these are multiple dimensions, so the number of combinations is n^k (roughly) **