Improve design of multi-barcode picker

[TheLastProject]

When Catima detects multiple barcodes in an image or PDF it creates a dialog window showing the multiple options. While this is functional, it could be hard for users to be able to recognize which barcode they're looking for.

Preferably, Catima would show the image and where on the image the barcode was detected for the user to tap on. But a good first improvement would be to show images of the found barcodes in the current selector (or building a similar selector) at least.