Remove VirtualFluidsDefinitions.h header file.
Remove redundant compiler definitions from gpu.cmake.

Few refactorings in cmake. Remove the old openmp flag. Put the intel and gcc libraries in the compiler file.

Make use of the new cmake command: target_link_options, target_compile_options and target_compile_definitions.

Removed unused machine config files.
Removed CAB_COMPILER variable. compiler flag files is now loaded regarding the CMAKE_CXX_COMPILER_ID variable:
	https://cmake.org/cmake/help/latest/variable/CMAKE_LANG_COMPILER_ID.html
Removed the 64 bit support.

Renmade HOST in GridGenerator to CUDA_HOST because of a name conflict to MPI

Changed the setting the compiler options to the new cmake function: target_compile_options

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