Edwin Kempin c9694da1c2 Move classes that are related to external IDs into an own package
This enables follow-up changes to not expose implementation details of
reading/writing external IDs (since classes can be kept package
private now).

Change-Id: I4b3394592304d8391d7103821d46da7ce475be52
2017-03-27 15:38:01 +02:00
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