Use a dict to store the dolls

the existing variable was a set, all the existing use cases still work (contains tests, iteration, turning into lists...)

game/scripts/doll/main.rpy

@@ -1,3 +1,5 @@
+define renpy.store.states.dolls = {}
+
 init python:
     class Doll(DollMethods):
         # 0 - 50 = Skin/Body Layers
@@ -77,11 +79,7 @@ init python:
 
             self.build_image()
 
-            # Add doll name to global doll states store
-            try:
-                renpy.store.states.dolls.add(name)
-            except AttributeError:
-                renpy.store.states.dolls = {name}
+            renpy.store.states.dolls[name] = self
 
         def generate_hash(self):
             clothes_hash = str([x[0]._hash for x in self.states.values() if istype(x[0], (DollCloth, DollClothDynamic, DollMakeup)) and x[2]])