Plugin.Base: Make `PluginAction` return a `Bot` monad

Replace the `IO` return monad with `Bot`. `Bot` wraps the `IO` monad so
it should cover us for that, while additionally providing configuration
to plugin action functions.

There's also some extra cruft here from when I was experimenting. The
commit before this one and the next one or more were all written at once
in a jumbled mess. All the extra code is collateral from that.

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