Update .clang-format file

Karsten Suehringrequested to merge
ksuehring/VVCSoftware_VTM:clang-format-update into master

Changes include:

  • Updates for newer clang-format versions
  • Align across comments
  • Set C++ version to C++17
  • Don't split empty functions, etc.
  • Left align reference and pointer operators
  • Don't indent name spaces

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