This is a library that contains parts of worklets that can be
precompiled into a library.
Currently, this library contains the implementation of ScatterCounting.
CMake 3.12 introduces a ...<max> syntax in the version given to
cmake_minimum_required to automatically set policies to NEW up
to that version. Use it to avoid listing policies explicitly.
Adding an example that demonstrates how to write a distributed filter
that customizes the execution for all blocks in a MultiBlock. This is a
reinterpretation of the `reduce/all_to_all` example provided by DIY.
