Provides classes define the structure of Maze.

A Maze is a 2-D grid of individual MazeCells. The interpretation of the coordinate system, however, is delegated to the maze.geometry package which provides for Rectangular or Hexagonal grids.

A MazeCell has two subclasses.

• MazeCellEmpty. An otherwise unused cell. A MazeFiller will replace this with a MazeCellWall instance.
• MazeCellWall. A used cell. The MazeFiller has determined the collection of walls necessary to make this a piece of a path or a kink or a branch.