Use ItemValue instead of Kokkos::View where possible

CMakeLists.txt

src/CMakeLists.txt

src/experimental/AcousticSolverClass.cpp

src/experimental/AcousticSolverClass.hpp

src/experimental/AcousticSolverTest.cpp

src/experimental/AcousticSolverTest.hpp

src/experimental/CMakeLists.txt

src/experimental/MeshLessAcousticSolver.cpp

src/experimental/MeshLessAcousticSolver.hpp

src/experimental/RawKokkosAcousticSolver.cpp

src/experimental/RawKokkosAcousticSolver.hpp

src/main.cpp

src/mesh/Connectivity.cpp

src/mesh/Connectivity.hpp

src/mesh/GmshReader.cpp

src/mesh/ItemValue.hpp

src/mesh/Mesh.hpp

src/mesh/MeshData.hpp

src/mesh/MeshNodeBoundary.hpp

src/mesh/SubItemValuePerItem.hpp