Improvement

• Let archive nodes always get block from archive nodes in catch-up mode.

• Check the mining address prefix.

• Add RPC cfx_getStorageRoot for light nodes.

Bug fixed

• Fix a bug where users need to restart node before they can use a newly created account to send transactions.

• Fix a bug where a node may not catch up if all its peers are full nodes.

• Fix a bug that the maintenance of max_handshaking_count may cause unsigned int underflow.