Introduce Pointerwrapper

Simon Spannagelrequested to merge
pointerwrapper into master

Replace raw TRef references with smarter PointerWrapper classes which only resolve to a TRef when stored (manually via their store() method, respectively the petrifyHistory() method of the containing classes).

This is modeled after allpix-squared/allpix-squared!338 (merged).

This fixes #156 (closed)

Edited by Simon Spannagel

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