Handle updates in their own thread!

Scheme layer used: 55

This version handles **updates in a different thread** (if you wish to do so). This means that both the low level `TcpClient` and the not-so-low-level `MtProtoSender` are now multi-thread safe, so you can use them with more than a single thread without worrying!

This also implies that you won't need to send a request to receive an update (is someone typing? did they send me a message? has someone gone offline?). They will all be received instantly.

Some other cool examples of things that you can do: when someone tells you "Hello", you can automatically reply with another "Hello" without even needing to type it by yourself :)

However, be careful with spamming!! Do not use the program for that!