Merge pull request 'Add metis 5.1.1 to the 3rdParty folder and build within VirtualFluids when no metis path in the user config is set.' (#35) from peters/VirtualFluids_dev:feature/metis into develop

Changed in metis CMakeLists:
  - add cmake required version to 3.0
  - removed installation
  - add METIS options for idx54 and real64 bit.
  - set target include path
  - set public target defintions
  - put metis target into the 3rd folder group.

Merge pull request '.gitlab-ci uses irmb/virtualfluids-deps image' (#34) from marcus/VirtualFluids_dev:develop into develop

Merge pull request 'Check compiler warnings on clang, gnu and msvc and eliminate most of them.' (#33) from peters/VirtualFluids_dev:dev_compiler_warnings into develop

Add msvc warning level W4 and removed most of the warnings. Some of the warnings are suppressed (see MSVC.cmake)

# Conflicts:
#	src/cpu/VirtualFluidsCore/CMakeLists.txt
#	src/cpu/VirtualFluidsCore/CoProcessors/WriteMacroscopicQuantitiesCoProcessor.cpp
#	src/cpu/VirtualFluidsCore/Data/D3Q27EsoTwist3DSplittedVector.cpp
#	src/cpu/VirtualFluidsCore/Grid/BasicCalculator.cpp
#	src/cpu/VirtualFluidsCore/LBM/CumulantK17LBMKernel.h
#	src/cpu/VirtualFluidsCore/LBM/LBMKernel.h

Fix exclude in cmake target files.

Merge pull request 'Update line endings.' (#31) from peters/VirtualFluids_dev:open_source into open_source

Merge pull request 'Merge develop with got a merge from open source  before.' (#29) from peters/VirtualFluids_dev:develop into develop

# Conflicts:
#	.gitattributes
#	apps/cpu/Applications.cmake
#	apps/cpu/LidDrivenCavity/LidDrivenCavity.cpp
#	cpu.cmake
#	gpu.cmake
#	src/cpu/VirtualFluids.h
#	src/cpu/VirtualFluidsCore/BoundaryConditions/VelocityBCAlgorithm.cpp
#	src/cpu/VirtualFluidsCore/CMakeLists.txt
#	src/cpu/VirtualFluidsCore/Parallel/NullCommunicator.h

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

Merge pull request 'feature/update_cpu_to_open_source' (#27) from peters/VirtualFluids_dev:feature/update_cpu_to_open_source into develop