Use data type from CMake in codegen
This merge requests updates the code generation scripts such that the generated code uses the same data type as in waLBerla, i.e., as specified in CMake (WALBERLA_DOUBLE_ACCURACY).
This merge requests updates the code generation scripts such that the generated code uses the same data type as in waLBerla, i.e., as specified in CMake (WALBERLA_DOUBLE_ACCURACY).