Crossed Dungeon generation work

-Rewrite of step 3b for accuracy - verified acceptable speed
--Can now detect an impossible balance situation and restart
-Eliminated false negatives in step 4 (still need to rework false positives)
-Minor key logic improvement

BaseClasses.py

@@ -1058,6 +1058,16 @@ class Polarity:
                 return False
         return True
 
+    def __hash__(self):
+        h = 17
+        spot = self.vector[0]
+        h *= 31 + (spot if spot >= 0 else spot + 100)
+        spot = self.vector[1]
+        h *= 43 + (spot if spot >= 0 else spot + 100)
+        spot = self.vector[2]
+        h *= 73 + (spot if spot >= 0 else spot + 100)
+        return h
+
     def is_neutral(self):
         for i in range(len(self.vector)):
             if self.vector[i] != 0:
@@ -1116,6 +1126,7 @@ class PolSlot(Enum):
     EastWest = 1
     Stairs = 2
 
+
 class CrystalBarrier(FastEnum):
     Null = 0  # no special requirement
     Blue = 1  # blue must be down and explore state set to Blue