Core: provide a way to add to CollectionState init and copy

SM: use that way
OoT: use that way

test/general/__init__.py

@@ -1,6 +1,6 @@
 from argparse import Namespace
 
-from BaseClasses import MultiWorld
+from BaseClasses import MultiWorld, CollectionState
 from worlds.AutoWorld import call_all
 
 gen_steps = ["generate_early", "create_regions", "create_items", "set_rules", "generate_basic", "pre_fill"]
@@ -18,4 +18,4 @@ def setup_default_world(world_type):
     world.set_default_common_options()
     for step in gen_steps:
         call_all(world, step)
-    return world
+    return world