Context (caller's) as a property of the functor when triggering

[MatthewDavidCampbell]

Corner case whereby it would be helpful if the functor had a property housing the context of the action caller. Actions are triggered with:

 functor[functor.sync?"trigger":"triggerAsync"].apply(functor, arguments)

Can we save the "this" context either as a property to functor or passed in with the apply at the tail of the arguments?

Reason being is that on preEmit events it would be cool to check whom called and possibly modify the arguments to shouldEmit.