In order to support multiple different forms of loading, we have
designed a toolkit that we are calling "The Load Graph Toolkit". It
allows us to describe a series of work as a graph, and provides a way
for us to move through that graph, executing actions at each step.
This is the first step toward resolving #816, #997, and #1570. This
will provide the framework to build a more structured system for
loading and unloading content.
Issue #816
Issue #997
Issue #1570
Change-Id: I2f91089d07b0c901843550492308fcfd775bf161