Commits on Nov 11, 2022

1. Connection filters (cfilter) addition to curl: …

                       - general construct/destroy in connectdata
                       - default implementations of callback functions
                       - connect: cfilters for connect and accept
                       - socks: cfilter for socks proxying
                       - http_proxy: cfilter for http proxy tunneling
                       - vtls: cfilters for primary and proxy ssl
                       - change in general handling of data/conn
                       - Curl_cfilter_setup() sets up filter chain based on data settings,
                         if none are installed by the protocol handler setup
                       - Curl_cfilter_connect() boot straps filters into `connected` status,
                         used by handlers and multi to reach further stages
                       - Curl_cfilter_is_connected() to check if a conn is connected,
                         e.g. all filters have done their work
                       - Curl_cfilter_get_select_socks() gets the sockets and READ/WRITE
                         indicators for multi select to work
                       - Curl_cfilter_data_pending() asks filters if the have incoming
                         data pending for recv
                       - Curl_cfilter_recv()/Curl_cfilter_send are the general callbacks
                         installed in conn->recv/conn->send for io handling
                       - Curl_cfilter_attach_data()/Curl_cfilter_detach_data() inform filters
                         and addition/removal of a `data` from their connection
                       - adding vtl functions to prevent use of Curl_ssl globals directly
                         in other parts of the code.

   

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