State injection containers

[rishson]

@matt-gadd commented on Thu Feb 16 2017

We're now at a point where the widgeting system is nearly complete and for building components the property system suffices for passing of state and callbacks.

In larger apps this is a cumbersome and coupled way to get state and callbacks/actions down the tree of widgets when working with an application state store.

In react-redux the concept of aContainer act as a kind of virtual widget which allow you to side load application state and actions. We have had similar concepts in the past with externalState that do similar but not quite as complete in functionality.

As part of the issue we should probably look at whether there is a place for an actions like mechanism (dojo/actions) or whether simple functions suffice.