Small update to ParticleV2

Miroslav Saurrequested to merge
msaur_particleV2 into master

A small collection of ParticleV2 patches as suggested by @graven:

  • std::array in emplace_back replaced by LHCb::span + template with the old one
  • added explicit destructors

Related issue: #159

Edited by Miroslav Saur

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