GUI: cleanup from audit
Config: switch to XDG compliant config file path by default
Graph: review and document GraphObject implementation
IMAP: cleanup from audit
NTLM: adjust DavMail NTLM and SpNego to avoid compilation warning
Linux: clean desktop entry content to match recommendations
SMTP: allow sending multiple messages with the same message id, see https://github.com/mguessan/davmail/issues/433
SMTP: cleanup from audit