Merge branch 'euler' into develop

CMakeLists.txt

src/Examples/CMakeLists.txt

src/Examples/advection/Riemann1DBoundaryConditions.h

src/Examples/advection/Riemann2DBoundaryConditions.h

src/Examples/advection/tnl-run-advection

src/Examples/flow-sw/BoundaryConditionsBoiler.h

src/Examples/flow-sw/BoundaryConditionsCavity.h

src/Examples/flow-sw/CMakeLists.txt

src/Examples/flow-sw/CompressibleConservativeVariables.h

src/Examples/flow-sw/DensityBoundaryConditionBoiler.h

src/Examples/flow-sw/DensityBoundaryConditionCavity.h

src/Examples/flow-sw/EnergyBoundaryConditionBoiler.h

src/Examples/flow-sw/EnergyBoundaryConditionCavity.h

src/Examples/flow-sw/LaxFridrichs.h

src/Examples/flow-sw/LaxFridrichsContinuity.h

src/Examples/flow-sw/LaxFridrichsEnergy.h

src/Examples/flow-sw/LaxFridrichsMomentumBase.h

src/Examples/flow-sw/LaxFridrichsMomentumX.h

src/Examples/flow-sw/LaxFridrichsMomentumY.h

src/Examples/flow-sw/LaxFridrichsMomentumZ.h