Simplify selectors for Fatras processes
Split the Process
selectors into two categories: input selectors that take ActsFatras::Particle
and Acts::MaterialProperties
as input and particle selectors that only take ActsFatras::Particle
. Simplify most selectors to particle selectors. Contains some related fixes.
Fixes #698 (closed). Depends on !760 (merged) and must be merged afterwards.
Edited by Moritz Kiehn