MxFlcPresenter vtable70, m_unk64 (#304)

* MxFlcPresenter: vtable70

* begin work on MxFlcPresenter's m_unk64

* Add another function that makes use of the FLIC header

* Remove space

---------

Co-authored-by: Christian Semmler <mail@csemmler.com>

LEGO1/mxloopingflcpresenter.h

@@ -18,6 +18,8 @@ public:
 		return "MxLoopingFlcPresenter";
 	}
 
+	virtual void NextFrame() override; // vtable+0x64
+
 private:
 	void Init();
 	void Destroy(MxBool p_fromDestructor);