NFT multi-token display

[mikera]

NFTs should show a collection of unique tokens owned for each NFT address (which effectively represents a "class " of NFTs e.g. cryptokitties)

Features

• Identicon or similar for each NFT
• Ability to select multiple tokens
• Ability to transfer a set of tokens

Possibly user needs to go to a specific screen for each NFT class? In this case a short summary could be displayed on asset overview screen (e.g. "123 tokens owned")