add Lego3DManager and related, fix a function signature

LEGO1/lego3dview.h

@@ -0,0 +1,16 @@
+#ifndef LEGO3DVIEW_H
+#define LEGO3DVIEW_H
+
+#include "viewmanager.h"
+
+class Lego3DView
+{
+public:
+  inline ViewManager *GetViewManager() { return this->m_viewManager; }
+
+private:
+  char unknown[0x88];
+  ViewManager *m_viewManager;
+};
+
+#endif // LEGO3DVIEW_H