Method getSubname

samples/SampleBase/scene/SceneController.cpp:119–119

	virtual ~SceneActor() {}
	virtual const char* getName() const = 0;
	virtual const char* getSubname(int subindex) const { return nullptr; }
	virtual ImVec4 getUIColor() const = 0;
	virtual void drawUI(int subindex) {}
	virtual void drawStatsUI(int subindex) {}