v8.0.0

• Added PINGRESP timeout and made internal force_disconnect() calling in the strand. (#649)
• Added async_client example. (#647)
• Made async_connect actually async. (#643)
• Added missing packet types to switch case. (#642)
• Enabled cmake target configuration. (#632)
• Made mqtt::shared_any force_move the constructor parameter into the member variable. (#629)
• Added io_context getter for servers. (#627)
• Tracked total bytes sent and received on socket. (#625, #641)
• <<<< breaking change >>>> Replaced use of boost::asio::deadline_timer with boost::asio::steady_timer. (#621, #626)
• Added getter for client_id_. (#619)
• Use the -fsyntax-only flag instead of --preprocess for header checking (#617)
• Added inflight subscribe and unsubscribe packet_id clean up mechanism. (#612)
• Added protocol error processing if control packets are received before connect/connack is received. (#611)
• Fixed uninitialized pubrel reason code. (#607)
• Fixed inefficient packet on puback/pubrec/pubrel/pubcomp. (#604)
• Added getters for publish and pubrel message. (#603)
• <<<< breaking change >>>> Fixed message version of for_each_store. (#602)
• Skipped properties phase if remaining length is 0. (#600)
• Updated v5_message.hpp pubrel fixed header flags. (#599)
• <<<< breaking change >>>> Updated minimum boost requirement to 1.67.0. (#595)
• Use std::move instead of std::forward in null_strand. (#594)
• Removed boost::static_visitor inheritance. (#589)
• Refined CI. (#587, #590, #613, #618)
• Added redirect supporting function and an example. (#585)
• Fixed warnings. (#582, #596, #620)
• <<<< breaking change >>>> Removed packet_id from restoring functions. (#581)
• Rifined examples. (#580)
• Added native_handle getting function. (#577)
• Fixed missing base class hander call. (#576)
• Fixed accumulate type. (#570)
• Added workaround of libstdc++ std::tuplestd::any bug. (#568, #569, #571)
• Use mqtt::force_move for test_broker. (#562)
• Added no property overloads for MQTT v3.1.1 users. (#561)
• Fixed missing argument on async_send_pubrel. (#560)
• Migrate CI from travis-ci to github actions. (#553, #556, #564)
• <<<< breaking change >>>> Modified buffer lifetime management strategy to meet Boost.Asio CompletionToken. (#552)
• <<<< breaking change >>>> Added noexcept to event handler virtual functions. User needs to catch the exception in the handlers if an exception is thrown. (#551)
• <<<< breaking change >>>> Introduced publish_options and subscribe_options. Remove *_dup functions. (#548, #579)
• <<<< breaking change >>>> Removed acquired_* family. Now non acquired name version has the overload that takes packet_id parameter. (#547)