Implement a common internal socket/data transfer protocol

[vnuotio]

• Connections will be handled by Wi-Fi Direct, but receiving side should be able to parse different types to data.
• A common protocol should be established for sending packets of data. This could be [type][size][content] or any other reasonable packet.
• Should be done mostly to be able to parse incoming data properly.
• Java Sockets seem to use TCP/IP.