refactored mem mgmnt in MM
this patch changes the memory management in the middleman, i.e., ´continuable´ no longer reference counted but provides a `dispose` member function; using reference counting to manage object lifetimes in the MM is an overkill, because it is quite simple to decide when an IO worker is done; this change allowed us to remove `broker_backend`, because `broker` can now inherit both `local_actor` and `continuable` without having two reference counts
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