IRC: Chop messages longer than 400 characters

The IRC protocol doesn't permit messages longer than 512 bytes
(https://news.ycombinator.com/item?id=7991049). This includes server,
channel, hostname, etc. information that's also included in the message.

In order to be able to send longer messages, chop them at 400 characters
(https://wholok.com/irc/), which seems like a "reasonable" hard-coded
value.

We already split our messages at newlines, so we need to effectuate a
double split here. First we split at 400 characters because we might
have a line that runs longer than that before encountering a newline. To
do this, we use the `chunksOf` function
(https://wiki.haskell.org/Data.List.Split).

Then, when splitting on newlines, we take the list produced by splitting
at 400 characters, and must split the elements inside that list. This
creates a two-dimensional array. In order to flatten the array, we use
the `concat` function
(https://stackoverflow.com/questions/5994051/is-there-a-function-to-flatten-a-nested-list-of-elements).

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