Visual improvements

• Minor visual improvements
• Edit contract in the list

EIP-1559 support

1. EIP-1559 gas price options are now supported. Old Gas Price removed in favor of EIP-1559 introduced parameters Max Fee Per Gas and Max Priority Fee Per Gas
2. Greatly reduced bundle size

Metamask update

Metmamask module rewritten to support its latest breaking changes (Jan 2021)

Transactions - Loading & Broadcasting

1. New tab - Load Transaction. Load any transaction that was saved earlier and sign it as usual contract transaction.
2. New tab - Broadcast Transaction. Load a signed transaction and broadcast it to the selected network.
3. While adding new contracts it is possible now to check Etherscan for its ABI, in case it is verified.
4. And several minor UI improvements

Backend for static and Infura proxy

1. Backend Node.js app added
2. Its main purpose is to serve static pages like 'Privacy Policy'.
3. Its second purpose is to proxy queries to Infura node, in order to hide the API key.