Added Radial placement
Bugfix: The system actor (ASysActorInstanced class) from the plugin was available in the list of actors (for placement in the scene).
Bugfix: after “Recreate instance” Ctrl + Z was not available
Bugfix: after cloning an instance, moving it, exiting the “editing instance” mode and pressing Ctrl + Z, an actor was created that could not be deleted.
Other: in the system actor Static Mesh cannot be changed
Changes have been made that may prevent crash (however, I could not repeat the error that the user wrote about above).