Revise Intervehicular Communication protocol

[Santara]

The following architecture must be implemented:

1. The buffer should be organized as a queue of dictionaries. Each dictionary must hold the variables of one time step.
2. Each agent has its own buffer_size. If it is requested variables which are older than its buffer_size it will throw an error.
3. At every step, an agent should organize its full observation as well as its action in the form of a dictionary where each variable is accessible by its name. This dictionary should be inserted into the buffer.
4. While making an observation, Agent_1 should request Agent_0 for sharing variables by providing a list of variable names and the number of time steps that it wants to observe.