feat(functors) implement automatic wrapping/unwrapping of optional returns from functor

Needs: Analysis!901 (merged)

This implements:

1. Functors::Optional as alternative to std::optional, please see Functors/Optional.h for motivation.
2. Automatic wrapping and unwrapping by the underlying framework if a chained functor returns a Functors::Optional

ToDo / Questions:

• Not yet implemented is the handling of an optional return value by a functor that is bound to another functor.
• Adapt FunTuple to understand the new optional output cc @amathad

Some smaller fixes for Moore!1461 (closed) :

• add ADDRESSOF functor
• fix RPPVIPCHI2, SHARE_BPV
• enable multiple args for non SIMD input

cc @tfulghes @graven @amathad