This monad allows keybindings to look and feel like one is writing
blocking code with constructs like:

key <- nextKey
when (key == x) $ do
  key2 <- nextKey
  ...
...

but this code does not block or do any io shenanigans, it under the hood
just changes the handler on the state. It seems pretty awesome and opens
the doors for some pretty expressive key bindings.

This adds new layout configuration, preparing for actually using the
layouts. This also restructures the code and tries to keep code
interfacing with the foreign structures together and rename them to more
sensible names.

The plugin now passes the key events to the Wayland clients.