Consider grouping Layer method parameters in structs (was ACTS-465)

Original author Hadrien Benjamin Grasland @hgraslan

The Layer methods take many parameters, some of which always go together (bcheck, collectSensitive, collectMaterial, and collectPassive; startSurface and endSurface).

Since methods with lots of parameters (or the structs with lots of members that are used to feed them) are not very ergonomic in C++, it might make sense to group these parameters together more.

Edited Mar 27, 2019 by Moritz Kiehn

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