Interface change of DoDecay() and DoInteraction()

added 9 commits

2d3fc97d - 1 commit from branch history
c3c88225 - use SecondaryView instad of SeoncdaryView::GetProjectile() as argument
7a6af436 - use SecondaryView in DoInteraction() instead of projectile
ca7a1f60 - adapt testCascade
b9e3e14d - added parent() function to get original parent particle back
79361796 - prjectile -> view
00dd4c5b - style
4037593c - clang setup-view
25580181 - adapted tests to DoInteraction(SecondaryView)

enabled an automatic merge when the pipeline for 25580181 succeeds

I can see why this is needed, but I still don't like the "working solution". Let's keep in mind to keep search for the optimal interface here.

canceled the automatic merge

added 1 commit

still to do:

adapt HadronicElasticInteraction::DoInteraction() to add secondary instead of modyfing (to be deleted) projectile
two-stage Sibyll nuclear interaction with temporary stack of inelastic nucleons

added 14 commits

75bf7157 - use SecondaryView instad of SeoncdaryView::GetProjectile() as argument
0557a5a7 - use SecondaryView in DoInteraction() instead of projectile
ba9eb0ac - adapt testCascade
4ccf13bb - added parent() function to get original parent particle back
27b59a63 - prjectile -> view
3eca9dd3 - style
88783fb3 - clang setup-view
7dc8fa27 - adapted tests to DoInteraction(SecondaryView)
ca7b77f9 - Merge branch '303-type-of-projectile-in-stackview' into addsecondary_interface
77a48b3f - fixed clang problem by moving static_pow out of detail.
ec50f94a - fixed clang problem by moving static_pow out of detail.
8c0311eb - towards transparent HistorySecondaryView
20299396 - slight cleanup of SetupStack
d08bdb71 - changed HistorySecondaryView to HistorySecondaryProducer. Now also secondaries...