Refactor map generator package

- Move room generators to map.generators.room
- Move corridor generators to map.generators.corridor

Generators have a generate() method that generates the things they place,
and an apply() method that applies their objects to a grid of tiles.

erynrl/map/generator/__init__.py

@@ -0,0 +1,29 @@
+import numpy as np
+
+from ..tile import Empty
+from .corridor import CorridorGenerator
+from .room import RoomGenerator
+
+
+class MapGenerator:
+    '''Abstract base class defining an interface for generating a map and applying it to a set of tiles.'''
+
+    def generate(self, tiles: np.ndarray):
+        raise NotImplementedError()
+
+
+class RoomsAndCorridorsGenerator(MapGenerator):
+    '''
+    Generates a classic "rooms and corridors" style map with the given room and corridor generators.
+    '''
+
+    def __init__(self, room_generator: RoomGenerator, corridor_generator: CorridorGenerator):
+        self.room_generator = room_generator
+        self.corridor_generator = corridor_generator
+
+    def generate(self, tiles: np.ndarray):
+        self.room_generator.generate()
+        self.room_generator.apply(tiles)
+
+        self.corridor_generator.generate(self.room_generator.rooms)
+        self.corridor_generator.apply(tiles)