Desert Regions, Doors, and fixes associate with the new stuff

Updated generation algorithm to use new Sector object
Moved Dungeon items back for now
Created region lists for ease of grouping

BaseClasses.py

@@ -886,6 +886,13 @@ class RegionChunk(object):
         self.unlinked_doors = set([])
 
 
+class Sector(object):
+
+    def __init__(self):
+        self.regions = []
+        self.oustandings_doors = []
+
+
 class Boss(object):
     def __init__(self, name, enemizer_name, defeat_rule, player):
         self.name = name