Add TCP socket class

[RiscadoA]

Header: core/net/tcp_socket.hpp
Source file: core/net/tcp_socket.cpp

Class name: cubos::core::net::TCPSocket

It should provide:

• default constructor
• forbid copy construction
• forbid copy assignment
• ??? connect(const Address& address, uint16_t port, int timeoutMs = 0) should return some kind of result code.
• ??? send(const void* data, size_t size, std::size_t& sent) should return some kind of result code.
• ??? receive(void* data, size_t size size, size_t& received) should return some kind of status code.
• void setBlocking(bool blocking) - defaults to true. If set to false, functions return immediately (see POSIX sockets / winsocks docs)