* 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