Changed typedefs to using.

# Conflicts:
#	apps/cpu/LidDrivenCavity/LidDrivenCavity.cpp
#	src/cpu/VirtualFluidsCore/BoundaryConditions/BoundaryConditions.h
#	src/cpu/VirtualFluidsCore/CoProcessors/WriteBoundaryConditionsCoProcessor.cpp
#	src/cpu/VirtualFluidsCore/CoProcessors/WriteMacroscopicQuantitiesCoProcessor.cpp
#	src/cpu/VirtualFluidsCore/Data/D3Q27EsoTwist3DSplittedVector.cpp
#	src/cpu/VirtualFluidsCore/Data/DistributionArray3D.h
#	src/cpu/VirtualFluidsCore/LBM/CumulantK17LBMKernel.h
#	src/cpu/VirtualFluidsCore/LBM/LBMUnitConverter.h
#	src/cpu/VirtualFluidsCore/Parallel/NullCommunicator.h
#	src/cpu/VirtualFluidsCore/Visitors/SetConnectorsBlockVisitor.h
#	src/cpu/VirtualFluidsCore/Visitors/SetKernelBlockVisitor.cpp
#	src/cpu/VirtualFluidsCore/Visitors/SetKernelBlockVisitor.h

Merge pull request 'Add clang tidy and fixes a lot of detected issues.' (#36) from peters/VirtualFluids_dev:feature/clang_tidy into open_source

Remove misc-non-private-member-variables-in-classes, as virtualfluids has multiple protected variables.

In CMakeLists enables clang-tidy for all targets.

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

Merge pull request 'feature/compiler_warnings' (#32) from peters/VirtualFluids_dev:feature/compiler_warnings into open_source

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