add functions for showing ascii map

[janash]

This PR adds some code for creating an ascii map of rooms visited.

• A 'map' item is added in the study. Once the map is picked up, it will automatically populate with rooms the player has visited.
• A command 'show map' is added
• Some additional variables are added for book keeping (which rooms have been visited - for map purposes)
• The module map.py contains functions associated with the map. In order to get room positions, the rooms are treated as a graph and a depth first search algorithm is used to get room positions (https://en.wikipedia.org/wiki/Graph_traversal).

I've separated most of the map functions into a separate module to hide most of the code.

The map is drawn by house floor and by the row the room is on in the show_map function. The map is rendered each time the function is called. The current room label is printed in ALL CAPS.

I've also changed some comments using # to use ''' - just a Python style thing.

[janash]

Here is the full map from the code as written:

Floor 2

-..........-+----------+-..........-
 .......... |          | .......... 
 .......... |          | .......... 
            | Sun Room |            
 .......... |          | .......... 
 .......... |          | .......... 
-..........-+----------+-..........-

+----------++----------++----------+
|          ||          ||          |
|          ||          ||          |
| Office   || Master Be|| Bathroom |
|          ||          ||          |
|          ||          ||          |
+----------++----------++----------+

-..........-+----------+-..........-
 .......... |          | .......... 
 .......... |          | .......... 
            | Upstairs |            
 .......... |          | .......... 
 .......... |          | .......... 
-..........-+----------+-..........-

-..........--..........--..........-
 ..........  ..........  .......... 
 ..........  ..........  .......... 
                                    
 ..........  ..........  .......... 
 ..........  ..........  .......... 
-..........--..........--..........-

-..........--..........--..........-
 ..........  ..........  .......... 
 ..........  ..........  .......... 
                                    
 ..........  ..........  .......... 
 ..........  ..........  .......... 
-..........--..........--..........-
Floor 1

-..........--..........--..........-
 ..........  ..........  .......... 
 ..........  ..........  .......... 
                                    
 ..........  ..........  .......... 
 ..........  ..........  .......... 
-..........--..........--..........-

-..........-+----------+-..........-
 .......... |          | .......... 
 .......... |          | .......... 
            | Garden   |            
 .......... |          | .......... 
 .......... |          | .......... 
-..........-+----------+-..........-

+----------++----------++----------+
|          ||          ||          |
|          ||          ||          |
| Parlor   || Atrium   || Guest Bed|
|          ||          ||          |
|          ||          ||          |
+----------++----------++----------+

+----------++----------++----------+
|          ||          ||          |
|          ||          ||          |
| Library  || Hall     || Dining Ro|
|          ||          ||          |
|          ||          ||          |
+----------++----------++----------+

+----------++----------++----------+
|          ||          ||          |
|          ||          ||          |
| Study    || Kitchen  || Pantry   |
|          ||          ||          |
|          ||          ||          |
+----------++----------++----------+

[darrell24015]

The map is a great addition to the game. Thanks!