Ganon at Uncle softlock fix

-From KevinCathcart, this adds a new region to the world for the castle courtyard reachable from the exit to the uncle tunnel and from the upper ledge of Hyrule Castle but not the main gate. In effect, this changes nothing if Ganon is not at the uncle passage, and if Ganon is at the uncle passage, either Mirror + pyramid access, Master Sword, or a connecting cave to the upper ledge of Hyrule Castle will be required to access the main gate. This is necessary to fix a very rare softlock in which the player could defeat Agahnim, lose access to the Hyrule Castle main gate, and make the seed impossible.

EntranceShuffle.py

@@ -1161,6 +1161,7 @@ mandatory_connections = [('Links House', 'Links House'),  # unshuffled. For now
                          ('Desert Palace Stairs Drop', 'Light World'),
                          ('Desert Palace Entrance (North) Rocks', 'Desert Palace Entrance (North) Spot'),
                          ('Desert Ledge Return Rocks', 'Desert Ledge'),
+                         ('Hyrule Castle Ledge Courtyard Drop', 'Hyrule Castle Courtyard'),
                          ('Throne Room', 'Sewers (Dark)'),
                          ('Sewers Door', 'Sewers'),
                          ('Sanctuary Push Door', 'Sanctuary'),