change summary:
- revised native class ctor init code gen for instanced default subobjects (DSOs)
- revised native class ctor init code gen for non-native components (SCS nodes)
- added support to bypass native class ctor init code gen for editor-only subobjects
- added support to fall back to creating a dummy UActorComponent/USceneComponent in the case of an editor-only subobject dependency
- added support for generating native class ctor code to set up the RootComponent property when there is not already a native root
- added support for populating the BlueprintCreatedComponents array at Actor construction time for generated BP native classes
- fixed some compile issues after generating native code and attempting to rebuild project code
- fixed a runtime issue with generated native ctor init code for UCS-added components
#codereview Maciej.Mroz
[CL 2673022 by Phillip Kavan in Main branch]
3d5b4fe44b