WIP: Move to using modules for implementing core behavior

Since modules can now intercept all messages in the channels they're
listening for, it'd be cool to have modules handling things like making
sure the Omnibot.State stays updated as appropriate, and that pings are
ponged, etc.

This will probably deprecate the router, since it's been reduced to a
single function call, but we'll see about that.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

lib/module.ex

@@ -1,7 +1,7 @@
 defmodule Omnibot.Module do
   defmodule Hooks do
     defmacro __before_compile__(_env) do
-      quote do
+      quote generated: true do
         @impl true
         def on_channel_msg(_channel, _nick, _line), do: nil