Core: Add connect_entrances world step/stage (#4420)

* Add connect_entrances

* update ER docs

* fix that test, but also ew

* Add a test that asserts the new finalization

* Rewrite test a bit

* rewrite some more

* blank line

* rewrite rewrite rewrite

* rewrite rewrite rewrite

* RE. WRITE.

* oops

* Bruh

* I guess, while we're at it

* giga oops

* It's been a long day

* Switch KH1 over to this design with permission of GICU

* Revert

* Oops

* Bc I like it

* Update locations.py

Main.py

@@ -148,7 +148,8 @@ def main(args, seed=None, baked_server_options: Optional[Dict[str, object]] = No
     else:
         multiworld.worlds[1].options.non_local_items.value = set()
         multiworld.worlds[1].options.local_items.value = set()
-    
+
+    AutoWorld.call_all(multiworld, "connect_entrances")
     AutoWorld.call_all(multiworld, "generate_basic")
 
     # remove starting inventory from pool items.