Auto-scan for taxon and observation info when adding local images

[JWCook]

Scenario: an image was tagged previously with enough info to look up an existing taxon and/or observation.

• Read, combine, and process metadata on loading a local image
• Look for IDs in keywords or DwC metadata
• Look for rank=name formatted keywords or DwC metadata
• Query taxon
• If found, select this taxon on the taxon info screen (Taxon info display #3)
• Query observation
• If found, select this observation on the observation info screen (Organize (rename / move) image files based on taxon and observation info #46 )

Currently this only aims to support handling a single taxon or observation at a time. Handling a set of images associated with multiple taxa or observations may be out of scope, or a cool (but complicated) future feature.