Merge pull request 'feature/update_dev_to_os' (#28) from peters/VirtualFluids_dev:feature/update_dev_to_os into open_source

Merge pull request 'Adapt cmake and muparser to dev version,' (#23) from peters/VirtualFluids_dev:open_source into open_source

Update cmake to dev version.

Merge pull request 'Add 3rd library cmake functions.' (#19) from peters/VirtualFluids_dev:feature/clean_3rd_cmake_macros into open_source

Merge pull request 'feature/add_public_include_directories' (#17) from peters/VirtualFluids_dev:feature/add_public_include_directories into open_source

Merge pull request 'Adapt to develop basics.' (#16) from peters/VirtualFluids_dev:open_source into open_source

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

Merge pull request 'Move VirtualFluidsDefinition into basics.' (#12) from peters/VirtualFluids_dev:feature/fix_vf_definitions into open_source

Merge pull request 'Remove old readme.' (#5) from peters/VirtualFluids_dev:feature/remove_old_readme into open_source

Merge pull request 'Remove unused stuff and the global include from VirtualFluidsDefinition.h. Adds missing export includes.' (#2) from peters/VirtualFluids_dev:feature/build_fix into open_source

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

Merge pull request 'feature/update_readme' (#1) from peters/VirtualFluids_dev:feature/update_readme into open_source

Adds authors and contributing file. Clean up the readme file.
Set the minimum cmake version to 3.13 according to the readme entry.
Set the options BUILD_VF_CPU, BUILD_VF_GPU and BUILD_VF_UNIT_TEST to OFF by default.

* feature/updating_googletest:
  Set CMake Output directories for runtime, library, archive and pdb files for all libraries and executuables.
  Supress gtest rpath warning and remove install option.
  Added googletest untracked files. Adjust 3rd/gmock.cmake file.
  Update Googletest to v1.10.0. Put 3rdParty targets in msvc subfolder "3rd".

Set CMake Output directories for runtime, library, archive and pdb files for all libraries and executuables.