Keep selected enabled features on model updates instead of resetting them, better list of objects support and recover/disable previous selection on scene reloads.

example/object.py

@@ -13,7 +13,7 @@ from yacv_server import show, export_all  # Check out other exported methods for
 # Create a simple object
 with BuildPart() as example:
     Box(10, 10, 5)
-    Cylinder(4, 5, mode=Mode.SUBTRACT)
+    Cylinder(3, 5, mode=Mode.SUBTRACT)
 
 # Show it in the frontend with hot-reloading
 show(example)