Allow separation of instance and API URLs

Instance URLs and API URLs are not always the same, and require
different testing strategies. This allows the two types of URLs for an
instance, as well as the testing path, to be separated by a "|" character.
When Farside runs the instance checker, it will split instance strings
by that character and perform separate tests. Instances without a
separate API URL will only be tested once against their primary instance
URL.

Currently the only service using this paradigm is Piped, but allows for
others using the same approach to be added/tested in Farside in the
future.

Closes #115

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