Made interfaces for various aspects of retrieval that are Spring injectable.
Created an initial SBN retrieval task that will watch the /awips2/crawl directory, for proof of concept.
Amend:
Check whether debug is enabled prior to debug message.
Move log of request xml inside null check.
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Add GroupDefinition service.
Update subscriptions to not have a group name when their group is deleted.
Amend:
Rebase to HEAD of 13.2.1.
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