– add tick methods (that do not do much yet, but are called)
– create objects using logical 2d vectors and convert to 3d internally
This fleshes out the Object and ObjectManager class. Sadly removes the example scene and replaces it by a single object. The main reason for this is the fact that objects can no longer be manually placed in the 3D space, but are actually converted (mapped) from a logical 2D tile position into the 3D space.