Fix console error and warning messages

[StillFantastic]

• ethereum.enable() is deprecated
• web3.currentProvider.rpcEngine is undefined in ethutil.js
• MetaMask: MetaMask will soon stop reloading pages on network change.
  For more information, see: https://docs.metamask.io/guide/ethereum-provider.html#ethereum-autorefreshonnetworkchange
  Set 'ethereum.autoRefreshOnNetworkChange' to 'false' to silence this warning.