[reboot-proposal] Mixin to bind event data to state

[Yomguithereal]

A lot of domino events can be seen as side effects in a pure interface scenario. For instance, when you want to display a toaster with a message, it is the same as outputting to console with clojure. It is in fact a side effect. A needed one, however.

I often bind the state of a component to the state of a particular event. This is tiresome to write correctly and a simple mixin could do the trick.