Missing Implementation in FES / ImageClassification

[ppanopticon]

The retrieval side of the org.vitrivr.engine.base.features.external.implementations.classification.ImageClassification is currently missing. I think it would make sense to have an implementation for the first release candidate.

Basically, what we need here is an extension of a simple AbstractRetriever. Optionally, the retriever generates labels from an incoming image and uses them for the query.

[faberf]

Optionally, the retriever generates labels from an incoming image and uses them for the query.
I cannot imagine when this would be useful at the moment.

#98 I think this is already fine, no?

[ppanopticon]

Closed! Thanks @faberf