Adds Visualization for a vacuum world with no observation

[Rishav159]

• In this diagram, the user is presented with 8 random initial states of a 5-floors deterministic vacuum world. The user can record a sequence of actions which runs in all worlds at once. The reader is asked to come up with a sequence that works in all the worlds.
• The total number of possible initial states of the 5-floor world is 5*(2^5) = 160. This is simply too many to be displayed at once on the screen. The 2-floor world as described in the world has exactly 8 possible initial states which might fit exactly.
• The 2-floor world matches the book's description and is pretty simple to grasp. In this case, the diagram would contain all the possible initial states at once (and not a random subset of them). We could also hide States during the animation if they match some other states. This would be a great enactment of Figure 4.14 which has the flow diagram of all the possible belief states. The diagram could be modified accordingly.
• The 5-floor however, simply provides a little more complexity to the solution sequence. In the 2-floor world, the solution sequence is just 4 steps long (for instance left, suck, right, suck). In the 5-floor world, the solution will be much longer and would force the user to think about it. @redblobgames , I would like your view on which world would be better for this context.

Progress on #58 (not to be merged yet)

[redblobgames]

The diagram looks really cool. I wasn't sure what the reader was supposed to do here but after looking at the book again I understand what you're looking for. I think the 5-floor world is a reasonable choice. It is interesting enough that if you understand the concept you can come up with a sequence, and it is not too big so the sequence is not too long. You might add the text “Try to find a sequence of actions that will clean all the floors, no matter what the initial state of the world.”

[Rishav159]

Updated as per suggestions. It can be merged now.