Tell the Jackson JSON parser to ignore App/Apk fields that should never
come from the index, but instead are set locally to keep track of the
current state of things on the device.
There are two forms of tests to enforce that the proper things get
ignored. It is not possible to do this with decorators alone, so I
chose to use @JsonIgnore and leave the variables we want filled in
undecorated. Also, all of the instance variables in Apk/App/Repo
should come directly from the index metadata so that they are pure
data classes. Currently some state info is stored in them, those are
decorated with @JsonIgnore.
The tests then include lists of accepted and ignored properties, and
anything that is not in those lists will cause the tests to fail. So
if someone is adding a new instance variable, they will get a fail
until the tests are updated. One set of tests actually writes blank
instances out as JSON since that's the easiest test to write, and
Jackson treats @JsonIgnore the same in both directions. Then there is
another test that reads a JSON file with added, unsupported values to
make sure that they are properly ignored.
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