Previously, there were different pieces of business logic, invoked at
different times, which would touch subsets of the UI.
This change rips that out, and replaces it with a single place where the
UI is setup. This can always be called safely, and it will render the
correct data for the current state of the app (e.g. downloading, waiting
for install, etc).
The AppListItemState class is a dumb object which keeps track of what is
supposed to be displayed in the UI. The AppListItemController now
creates a different AppListItemState depending on what state the list
item is in. This AppListItemState is then used to bind the values of
each UI widget.
All of the binding code is now in the single `resetView()` method, but
all of the business logic for what the view should look like is
separated into different `getViewState*()` methods.
This separation should make it easier to make sense of the UI code, and
hopefully should be testable should somebody choose to write tests for
it in the future.
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