Merge branch 'ag/imap-send-resurrection'

"git imap-send" has been broken for a long time, which has been resurrected and then taught to talk OAuth2.0 etc. * ag/imap-send-resurrection: imap-send: fix minor mistakes in the logs imap-send: display the destination mailbox when sending a message imap-send: display port alongwith host when git credential is invoked imap-send: add ability to list the available folders imap-send: enable specifying the folder using the command line imap-send: add PLAIN authentication method to OpenSSL imap-send: add support for OAuth2.0 authentication imap-send: gracefully fail if CRAM-MD5 authentication is requested without OpenSSL imap-send: fix memory leak in case auth_cram_md5 fails imap-send: fix bug causing cfg->folder being set to NULL