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

test/general/__init__.py

@@ -5,7 +5,15 @@ from BaseClasses import CollectionState, Item, ItemClassification, Location, Mul
 from worlds import network_data_package
 from worlds.AutoWorld import World, call_all
 
-gen_steps = ("generate_early", "create_regions", "create_items", "set_rules", "generate_basic", "pre_fill")
+gen_steps = (
+    "generate_early",
+    "create_regions",
+    "create_items",
+    "set_rules",
+    "connect_entrances",
+    "generate_basic",
+    "pre_fill",
+)
 
 
 def setup_solo_multiworld(