Core: Remove Location.__hash__ (#4274)

`Location` does not override `__eq__` so should not override `__hash__`.

With this patch, this makes operations on sets of locations slightly
faster because they will use `object.__hash__` rather than
`Location.__hash__`.

`object.__hash__` is about 4 to 5 times faster than `Location.__hash__`
for me. Generation often uses sets of locations, so this slightly speeds
up generation.

The only place I could find that was hashing locations directly was
`WitnessLocationHint.__hash__`, but it has implemented a matching
`__eq__`, so is fine.

For security reasons, Python randomizes its hash seed each time it is
started, so the result of the `hash()` function is nondeterministic and
can't have been used by worlds for anything that needed to be
deterministic and can't have been used to compare information hashed at
generation time to information hashed by a client.

BaseClasses.py

@@ -1313,9 +1313,6 @@ class Location:
         multiworld = self.parent_region.multiworld if self.parent_region and self.parent_region.multiworld else None
         return multiworld.get_name_string_for_object(self) if multiworld else f'{self.name} (Player {self.player})'
 
-    def __hash__(self):
-        return hash((self.name, self.player))
-
     def __lt__(self, other: Location):
         return (self.player, self.name) < (other.player, other.name)