Fix clang compiler errors

Merged Kilian Weishaupt requested to merge fix/staggered-clang into master
  • due to a bug in clang (https://stackoverflow.com/a/47849501), myMultiTypeBlockvector.size() (which is static constexpr) has to be changed to MultiTypeBlockVector::size() to be used as a constexpr template argument

  • probably a similar issue with using Dune::Hybrid::forEach and std::get<>

  • fix several other clang-related errors

fixes #550 (closed)
depends on !1191 (merged)

Edited by Kilian Weishaupt

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