WIP: For Gauss-on-Gaussino: functional packers for MC objects and mc hits

Dominik Mullerrequested to merge
functional_packers_gaussino into master

Functional packers for MCParticle/MCVertex and templated packer for MC hits.

Supersedes !2463 (closed). See also !2871 (merged)

Edited by Rosen Matev

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