v2.0.0

• Add message extensions for MODE. They're not 'correct', based on hard-coding of Unrealircd behavior, but they're better than nothing. Thanks Dan Ugore.
• Replace the deprecated Client.notice() with one that sends a notice on IRC. This is the cause for the major version bump.
• Added Client.who to the OutputSocket. Doesn't return anything.
• Added support for showing your command handler in helpfiles. Use "{{!}}" in your help files.
• Added Response intents of "ctcp", "notice", and "none".
• Internal: Move the binary into /src, and then move to /bin so there is one canonical location for source.
• Internal: Started using natefaubion's lambda-chop macros.