Add Cost, Quantity and Folder mapping to the Import Function.

I do appreciate the functionality of using bulk insert, it seems pretty straight forward. However, often if getting cards from packs they somewhat all carry the same "cost" and if applied via an Excel sheet etc, the cost field is simply populated via drag and drop. Adjust this value requires manual user input, just like the quantity. A common "import" feature from document management systems is a field mapping, where column headers could be assigned or mapped to target fields.

It would also help to map the Cards to a designated folder in the collection ;)