• Switch to C++17
• Switch to SObjectizer-5.6
• Compatibility with so5extra-1.2 is broken
• New sublibrary so_5::extra::sync
• Changes in old sublibraries
• so_5::extra::disp::asio_thread_pool
• so_5::extra::enveloped_msg
• so_5::extra::mboxes::retained_msg
• so_5::extra::revocable_timer