v.5.8.0

This is the first release on the new 5.8 branch, that breaks compatibility with 5.7 in several places.

The v.5.8.0 introduces a new abstraction, message_sinks, and adds a couple of new dispatchers. There are also changes to the event_queue_t and abstract_message_box_t interfaces.

More information can be found in the corresponding Wiki page.