Multiple RCON connections to prevent lag

[Kiiyya]

Currently Bf4Client uses just one RconClient, which causes lag when the mapvote spammer runs 64 * 3 rcon queries at the same time, usually around 2.5s. Since there's a limit of 17ms per rcon packet per rcon connection.

[Kiiyya]

Now that I think about it, every time you send a chat message, it comes back doubly:

• Once as OK. This can be alleviated by multiple RCON connections.
• Once as an onChat event, which is broadcast... which multi-rcon won't solve :/.