Make image similarity search significantly faster #72
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This PR makes the image similarity search significantly faster.
It does this by comparing the hamming distance of 8-byte arrays instead of the Levenshtein distance of base64 encoded data.
I ran master and this revision (both in release mode) against 10,312 files in 9,619 folders. The current master took around 410 seconds to complete, this version takes around 70 seconds.