Merge branch 'feature/clean-cpu-cmake' into 'develop'

3rdParty/metis/metis-5.1.0/CMakeLists.txt

CMakeLists.txt

cpu.cmake

gpu.cmake

src/cpu/core/CMakeLists.txt

...imulationObservers/MPIIOMigrationBESimulationObserver.cpp

.../SimulationObservers/MPIIOMigrationSimulationObserver.cpp

...re/SimulationObservers/MPIIORestartSimulationObserver.cpp