Implement support for multi-line messages about matterhorn HOT 6 CLOSED

However we approach this, it would be good to make it so that pasting multiline content is treated as one post instead of a separate post for each line.

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I just implemented pasting support, but because we don't have smart multi-line editing yet, I made it so that only the first line of a multi-line paste gets pasted. See also b093755.

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Tristan also suggested permitting the user to invoke an external editor to compose the post. That will be trivial so I don't see why not.

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It also occurs to me that we could offer a post preview before sending, in case you got your syntax wrong.

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Okay, multi-line message editing is now implemented. To do it:

• Press M-e to start composing a multi-line message
• In multi-line mode, Enter adds line breaks rather than sending the message
• To finish editing, press Esc
• Once you're out of multi-line mode, you'll be shown a status message and you can send the message, resume editing, or cancel

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Barring issues with this implementation, this just leaves support for invoking external editors.

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