Modernize CaloTools

Merged Gerhard Raven requested to merge modernize-calotools into master
  • prefer direct member initialization
  • remove trivial destructors
  • prefer auto
  • prefer assignment to vector over explicit series of push_back
  • prefer std::max over a macro
  • prefer std::unique_ptr over raw pointer + explicit delete
  • prefer static const for static, constant data
  • do not cast if not needed
  • prefer extends over explicit virtual inheritance
  • add const

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