Improvements

• Return a detailed version for conflux --version.

Bug Fix

• Fix the bug of using wrong ws_address to open rpc endpoints.
• Fix Mismatch between definition and access of rpc-args error.

RPC Changes

• eth_getBlockByNumber returns null when parameter is bigger than latest block.

Note: The Windows version does not support opening the Core Space WebSocket port(jsonrpc_ws_port, jsonrpc_local_ws_port).