Change `Plugin` and `Message` from `String` to `Data.Text`

Use the `Data.Text` type instead of `String` in most of the places we
use it in `Plugin` and `Message`.

This allows us to more easily pass data between the IRC package. No more
kludgy `pack`s and `unpack`s in our IRC message handler.

The one thing we couldn't convert was our regex. From what I understand
(https://stackoverflow.com/questions/14922579/haskell-regular-expressions-and-data-text#14922626),
the regex library I'm using doesn't support `Data.Text`, so use
`String`s for that instead.

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