WIP: Modernize HltPackedData{Writer,Decoder}

Gerhard Ravenrequested to merge
thread-safe-packed-data-decoder into master
  • make HltPackedDataDecoder thread safe
  • move code and data common to Writer and Decoder into HltPackedData.h
  • amalgamate decoder and writer headers into their .cpp files
  • introduce LHCb::Hlt::PackedData namespace
  • prefer std::string_view over const std::string&
Edited by Gerhard Raven

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