Last version with frontend jitter and interpolation

From this version, I am going to change how the frontend works with backend data.
Until here we save the current backend snapshot and the previous one. This technique is used to introduce a little delay in rendering to avoid lag in-game.
Terrarium is not a game that needs this type of technology because the player does not have to react, or movement anything in the game. Terrarium is all about a simulation running completely in the backend.