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Improve portability of size_t and ptrdiff_t on recent compilers

Jean-Noël Grad requested to merge jngrad/walberla:size_t into master

Description of changes:

  • declare types size_t and ptrdiff_t as aliases of std::size_t resp. std::ptrdiff_t in src/core/DataTypes.h
  • in files that don't directly or indirectly include src/core/DataTypes.h, use the namespaced versions of these types
  • add missing <cstddef> includes

Fixes #157 (closed)

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