Improve ExifTool speed

It seems DO run a individual ExifTool instance once for every picture, and because exiftool need to start up, a big delay is apparent when managing photos.

Feature request to introduce a improvement method: Use '-stay_open' args of ExifTool to create a sub process that don't die, comminicate with it using pipe, it will bribg up a huge speed leap.

Opus does not run ExifTool, unless you've installed an add-in or something else which runs it. (There is one on the forum, for example.)

Ohoh, sorry, confused the DO and XnView metadata page.

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