Method DecreaseDepth

src/ObjectModel/ObjectModel.h:231–231

	void SetMaxDepth(unsigned int d) noexcept { maxDepth = d; }
	bool IncreaseDepth() noexcept { if (currentDepth < maxDepth) { ++currentDepth; return true; } return false; }
	void DecreaseDepth() noexcept { --currentDepth; }
	void AddIndex(int32_t index) THROWS(GCodeException);
	void AddIndex() THROWS(GCodeException);
	void RemoveIndex() THROWS(GCodeException);