NFT order verification support

[sakdeniz]

It would be good to make the necessary update so that 3rd party applications can verify the validity of nft buy/sell/mint orders.

[aguycalled]

added in navcoin-js@1.1.64

VerifyOrder(order)

Verifies the correctness of an order.

Example:

try {
    // Create buy order to buy an NFT mint in exchange of 10 xNAV payment and verify its correctness
    let fValid = await wallet.VerifyOrder(await wallet.CreateSellNftOrder("adb78af655528f5323e1c4c241a3c4576634449a98162697fc74bd2041e3d878", 4, "xNUBDkjEKRRxXfN3nAbeBZLWbePjswoKi9PHboXfJzbqmg6heMbxJhhovMmebqN96AaXyFYsZFfGXaGVptFnPzyQjGE8bbo83kEZG5jUXbKoaJPC4ztTg1zw3dUyavXNVVUoeuDB3Yu", 10*1e8))
} catch(e) {
    console.log(`error validating order: ${e}`);
}