Mongoose 7.4

• Added example for NXP RT1020 on Microsoft AzureOS
• Added support for Microsoft AzureOS
• Better diagnostics in mg_open_listener, #1359
• Including ipv6 wrapping brackets [] in the result of mg_url_host()
• Support multiple serving directories (web roots): opts.root_dir = "/path1,/uri1=/some/other/path". See 2139fbc
• Security enhancement in MQTT codepath
• Removed realpath() from the virtualised FS API
• Enhanced OpenSSL handshake codepath
• API change mg_iobuf_{append,delete} -> mg_iobuf_{add,del}
• Added WS defragmentation logic
• Added Add mg_check_ip_acl()
• API change: mg_next_comma_entry() -> mg_commalist()
• Added stm32-nucleo-f746z example
• Fixed HTTP chunk handling for larger chunks
• Enhanced FREERTOS + LWIP support - works out of the box!
• Refactored mg_mkpipe() and multithreading support
• Sending MG_EV_WS_OPEN to server connections, too
• Added MQTT over Websocket example
• Added virtualised FS support and built-in ability to pack static files into server binary and serve files without a "real" FS
• Added RISCV target to unit test