- curl: add --output-dir
- curl: support XDG_CONFIG_HOME to find .curlrc
- curl: update --help with categories
- curl_easy_option_*: new API for meta-data about easy options
- CURLE_PROXY: new error code
- mqtt: enable by default
- sftp: add new quote commands 'atime' and 'mtime'
- ssh: add the option CURLKHSTAT_FINE_REPLACE
- tls: add CURLOPT_SSL_EC_CURVES and --curves
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