"Bridge" mode improvements / additions

[edfletcher]

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As more people are using DRC as a bridge between Discord and IRC (a use case I did not initially design or build for but that DRC naturally does pretty well), I'd like to put focus on improving the rough edges of this use case and adding features that support it.

• [x] WrEtCh/eradev requested the ability to prefix messages to IRC with the Discord user name
  • resolved in 2ca8bc98: set config.app.includeDiscordAuthorNameInIRCMessages to true to have each IRC message prefixed as [nickname] message.
• [ ] WrEtCh/eradev suggested an excellent addition, but one which would require a fair bit of work: individual IRC connections for each Discord user. They even kindly shared a repo that does this, with irc-framework no less! We would do similar: instead of having the config.irc.registered structure, each Discord user would have a connection to the specified IRC server opened on their behalf, use their Discord nick as the IRC nick.

Important consideration: nothing added or improved for "Bridge" mode can be allowed to compromise the primary user experience as a single-user IRC client. Because it's my IRC client, and I don't want it to break. 😝