Implement socket encryption with libssl

When creating a Jardin Client or Server, encryption method is included in the parameters to the object creation function, but actually, no encryption method is available. The original idea is to use SSL socket encryption with libssl, as in original Jardin. This involves using libssl-specific functions instead of the common ones used right now to manage sockets. In Jardin-specific words, it would be just creating a new Connection Module using SSL sockets.