Aiotx

- TRON client send TRX and send TRC20 functions added and covered by tests, docs updated

- TON client memo added to send operation

- TRON client monitoring/wallet generation/get balance added
- Node connection error is now RpcConnectionError
- BTC init with failed get last block will do warning but not crash all code

- to_wei from_wei added hex numbers logic support / docs updated

- RpcConnectionError error added to be raised if there is any issues with connection to node

- EVM client `to_wei` and `from_wei` default value `ether` added