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

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

Move VirtualFluids header to src.
Add CI file and add files, only existing in the open source version.

Exclude the cmake .in.h file from the cmake target.

Add public target include directories to the cmake targets. Therefore the IncludeList.cmake files are not necessary anymore.
ADapt the export macros in the gks libraries.
Add 3rd/vtk helper cmake macro.
Gorup muparser into 3rd subfolder in visual studio project.

Make the cmake project more flexible while removing the CMAKE_SOURCE_DIR usage.

Make the cmake project more flexible while removing the CMAKE_SOURCE_DIR usage.

Remove the old write/read functions.

Remove unused stuff and the global include from VirtualFluidsDefinition.h. Adds missing export includes.

Warning: [-Wbackslash-newline-escape]
https://stackoverflow.com/questions/31673945/clang-backslash-and-newline-separated-by-space-in-single-line-comment

Moved numers/geomtry3d to /geometry3d.

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