[WIP] Implement Bity on Burner Wallet

[iamonuwa]

Fixes #107

[iamonuwa]

Going to make updates, the api has changed.

[TimDaub]

Two small things:

• You've added src/contracts back in again. We don't need those in this fork. So they can be deleted
• You've commented out requesting the price from coinmarketcap. I'd suggest we fix it instead, e.g. with this API: https://api.coingecko.com/api/v3/simple/price?ids=ethereum&vs_currencies=usd

[TimDaub]

• You've commented out requesting the price from coinmarketcap. I'd suggest we fix it instead, e.g. with this API: https://api.coingecko.com/api/v3/simple/price?ids=ethereum&vs_currencies=usd

Fixed here: #158

If u need help rebasing, please let me know.

[TimDaub]

Succeeded by #164