Purchase NFT in Harmony daVinci marketplace directly from wallet

[polymorpher]

This requires an implementation of EIP-1271 (https://eips.ethereum.org/EIPS/eip-1271) and corresponding support from daVinci marketplace smart contract. I am waiting for the repository owners to respond.

https://github.com/harmony-one/davinci_nft_marketplace/blob/040514b07ce8f8047daca4b67cd9156ff58af937/contracts/exchange/ExchangeV1.sol#L114

https://github.com/harmony-one/davinci_nft_marketplace/blob/040514b07ce8f8047daca4b67cd9156ff58af937/contracts/exchange/ExchangeV1.sol#L125

[polymorpher]

Upon reviewing updated code from daVinci, I confirm EIP-1271 and contract change on daVinci are no longer required.

To speed up integration, we will first enable NFT purchase directly from 1wallet. This will be released as part of the update in #94 . Later, we will add 1wallet as an option to connect in daVinci UI use the proper integration flow as discussed in #73 and https://github.com/polymorpher/one-wallet/wiki/App-Integration

[polymorpher]

Resolved by #154, released in https://github.com/polymorpher/one-wallet/releases/tag/v0.13.1