[UE4]AddToRoot()要与RemoveFromRoot成对出现

如果对某个UObject执行了AddToRoot()，那么需要在该UObject所属的上级UOject销毁前，执行RemoveFromRoot()，否则当程序退出时，会出现崩溃，崩溃堆栈： Assertion failed: !IsRooted() [File:d:\build\++ue4+release-4.13+compile\sync\engine\source\runtime\coreuobject\public\uobject\UObjectBaseUtility.h] [Line: 135] UE4Editor_Core!FDebug::AssertFailed() [d:\build\++ue4+release-4.13+compile\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:421] UE4Editor_UnrealEd!<lambda_26419e543909ee92ebfb672b1e9c08dc>::operator()() [d:\build\++ue4+release-4.13...

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