feat: random generators, frozenset and __hash__/__iter__/__getitem__/__contains__ in Ren'Py python

renpy.random/random get choices, sample, randrange and Random(seed); frozenset, iter and hash
are builtins. User classes may define __hash__ (dict keys), __iter__, __getitem__ and
__contains__; the converter accepts them instead of rejecting the whole class, which
removes the Perk/Skill/Status wall in SaintlyCorruption.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

frontend/tests/fixtures/dunders.py

@@ -0,0 +1,35 @@
+class Perk:
+    def __init__(self, key):
+        self.key = key
+
+    def __hash__(self):
+        return hash(self.key)
+
+    def __eq__(self, other):
+        return self.key == other.key
+
+
+class Bag:
+    def __init__(self, items):
+        self.items = items
+
+    def __iter__(self):
+        return iter(self.items)
+
+    def __getitem__(self, i):
+        return self.items[i]
+
+    def __contains__(self, x):
+        return x in self.items
+
+
+table = {}
+table[Perk("a")] = 1
+table[Perk("a")] = 2
+result_size = len(table)
+result_value = table[Perk("a")]
+bag = Bag([3, 4, 5])
+result_loop = [x * 2 for x in bag]
+result_item = bag[1]
+result_in = 4 in bag
+result_out = 9 in bag