Feature request - organize barcodes by folders

[pkundrat]

Barcode-Wallet is indespensable and i use it daily. The only limitation is that for cards that i use few times a year i tend not to load into my watch as then it takes too much time scrolling through the long list (and also lot of effort to organize them in a reasonable way - which means i need to remember how are barcodes groupped and groups ordered).
If it was possible to organize cards into folders, you could have a few folders for categories and then quickly locate the card within a category (so e.g. instead of scrolling through 50 items you would scroll through 6-7 folders and then through 5-10 items in given folder).
Even limited functionality to only allow one level of folders (without mixing barcodes and folders) would be a great improvement.
So it would be enough to add just the field Category/Folder and if populated, the app/widget would only show folders when opening. Ordering could still be done manually (as is now) so Category would only show a subset of the cards with the current order.