Mongoose 7.6

• Fixed mg_check_ip_acl()
• API change for mg_wakeup() - added ability to pass specific data to the mongoose task
• API change for mg_mqtt_pub() and mg_mqtt_sub() - using struct mg_str instead of struct mg_str *
• Added embedded FatFS support, mg_fs_fat
• API change for mg_http_upload() - added FS parameter
• API change for struct mg_fs - open and close calls accept void *, not struct mg_fd *
• Fixed mg_url_port()
• Added FS parameter to the struct mg_tls, in order to let TLS code to read certs from any FS
• Fixed DNS resolution issue: propagating DNS errors to the resolving connection
• Added ability to override stat() call for POSIX FS
• Improved UDP - not calling connect()
• Added SSDP search example
• Added huge-response example
• Added realpath() convenience macro for Win32
• Use int64_t for millisecond values in timers and for mg_millis()
• Removed mg_time() and usleep()
• Made mongoose friendly to the baremetal Keil build