Cart system improvements

[ismailToyran]

Brainstorm for the issues below,

• Cart system feedbacks #526 PR adds new modal for the transaction part. But there is no modal for currency approval right now. Should we enhance this modal or have 2 separate modal for currency + transaction?
• As we've enabled multi currency listing (during cart implementation it wasn't active), now we have a problem with multi currency offers, add to cart button will always pick the first currency if there are multi offers while not in the NFT detail page. We should find a way for this.
• ERC1155 quantity implementation