Graphing

@aravind1338 , can you add test cases to testing.py for the Map class? I put some examples in there, and you can check the python docs for unittest

I changed some of the code, but we may need a few more changes.

Clarification about the Trello card

• clean_directions(self, coordinates: List[Tuple[int, int], ...])
  • coordinates: List[Tuple[int, int], ...]: gives a list of coordinates that should be checked to make sure the model can move there without its FOV going off the map. This means that if the fov is x, the rover should remain at least x pixels away from the edge so that the fov does not go over the edge.

Also, if the rover does go over the edge or get closer than fov pizels to the edge, the Map should throw an error when get_fov is called so we can catch it before it propagates.