Functors: replace more types with instances

• prefer instances over types
• prefer composition over adaptation
• use concepts to constrain the types which are allowed for many templated functions
• unify handling of pointer argument -> optional output
• add (dummy) DetDesc version of the DeLHCb functor (which was DD4HEP specific) which throws an exception with an explanation when used instead of producing a compiler error

requires DaVinci!1228 (merged)