BREAKING CHANGE
Due to a lack of users, we remove the experimental code. The
latest implementation can be found in release v1.4.56. This does
not mean it will never be picked up again, but for now there are
no plans.
* Modernize some ofi transport code along the way
* Replace Boost.Container with `<memory_resource>`
* Introduce namespaced headers
* `<fairmq/Channel.h>`
* `<fairmq/Message.h>`
* `<fairmq/Poller.h>`
* `<fairmq/Socket.h>`
* `<fairmq/TransportFactory.h>`
* `<fairmq/UnmanagedRegion.h>`
* Compile-firewall Boost.Process in `shmem::Manager` because it conflicts
with standalone asio
