Plaintext negotiation during OTR handshake reveals email address
otrl_proto_default_query_msg by default is called with the "account name" for which OTR is being negotiated, but in some instances this is potentially sensitive information: e.g. when using Discord, the email address (defined as 'Username' for the Discord service) is disclosed.
Ideally an additional field should be added to
OtrgUiPrefs to allow the overriding of that which is disclosed during the negotiation.