4.1.0

• Re-designed unique_scope_guard. #146, #148, #149
• Fixed moved from object access. #144
• Removed code repeat. #140
• Added acquire_unique_packet_id_wait_until(). #138, #139, #141, #142, #151
• Relaxed epsp_wrap constructor for broker. #137
• Supported no matching subscribers reason code for broker. #133
• Added all.hpp generator. #131
• Refined client_cli. #130
• Added print payload option. #129
• Added keep_alive settiong to bench. #125
• Fixed num_of_const_buffer_sequence. #120, #121
• Refined tests. #120, #122, #123, #127, #128, #132, #134, #136, #145
• Refined packet comparison. #119
• Replaced return type with auto. #110
• Added UTF-8 checking. #107
• Replaced callback with CompletionToken on broker. #106
• Refined C++20 couroutune example. #105
• Used any_io_executor as the base of predefined mqtt protocol. #104
• Refined documentation. #103