tests for the last few issues (these test scripts should work with recent APIs, while the rest of the test suite needs an overhaul)

tests/test_iter_only.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+import sys
+import mcrfpy
+print("1 - Creating scene")
+scene = mcrfpy.Scene("test")
+print("2 - Getting children")
+ui = scene.children
+print("3 - Creating frame")
+frame = mcrfpy.Frame(pos=(0,0), size=(50,50))
+print("4 - Appending frame")
+ui.append(frame)
+print("5 - Starting iteration")
+for item in ui:
+    print(f"Item: {item}")
+print("6 - Iteration done")
+sys.exit(0)