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

Remove the old write/read functions.

Merge pull request 'Move VirtualFluidsDefinitions into basics.' (#14) from peters/VirtualFluids_dev:develop into develop

* feature/fix_vf_definitions:
  Move VirtualFluidsDefinition into basics.

# Conflicts:
#	gpu.cmake

Merge pull request 'Add missing export includes.' (#9) from peters/VirtualFluids_dev:feature/export_fix into develop

Merge pull request 'Increase required version to 3.18 and set the cmake policy CMPI0104 to NEW. Therefore the CMAKE_CUDA_ARCHITECTURES needs to be set.' (#8) from peters/VirtualFluids_dev:feature/cuda_policy into develop

Increase required version to 3.18 and set the cmake policy CMPI0104 to NEW. Therefore the CMAKE_CUDA_ARCHITECTURES needs to be set.

* feature/remove_old_readme:
  Remove old readme.

Merge pull request 'Added a lot of missing includes and fixed the Export statements.' (#6) from peters/VirtualFluids_dev:develop into develop

* feature/build_fix:
  Remove unused stuff and the global include from VirtualFluidsDefinition.h. Adds missing export includes.

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

* feature/update_readme:
  Extend the output part. Chang gpu and cpu to upper cases.
  Remove redundant -DNOMINMAX definition. Adds syscall include on unix systems.
  Set BUILD_VF_CPU default state to off.
  Fix typos.
  Change the default output path in the gpu app to <build>/bin/output according to the cpu app. 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.
  Adapt top level cmake list.

# Conflicts:
#	CMakeLists.txt
#	apps/gpu/LidDrivenCavity/LidDrivenCavity.cpp
#	src/basics/basics/utilities/UbSystem.h

Merge pull request 'fix issue with large data at restart' (#3) from kutscher/VirtualFluids_dev:develop into develop

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".

* feature/updating_googletest:
  Set CMake Output directories for runtime, library, archive and pdb files for all libraries and executuables.