Support ipv6 and address without port

### Feature Description
*
in CSharp
If query ipv6 server
```
MineStat ms = new MineStat("2ff8:82c6:3572:1473:1778:1234:ffc7:dfd7", 25565);
```
`ms.ServerUp` is false

and MineStat need a address and port,but sometimes the server hides the port, like aa.top

Start by locating the MineStat constructor and the server-address query logic, then reproduce the IPv6 example and the address-only case for aa.top. Done means MineStat accepts IPv6 servers and addresses without an explicit port, with server status detected correctly.

Written by the indexing model from the issue text.