Added example 3d model assets. (2x .obj, .mtl, .png -files)
Added classes Model, Mesh and Material.
Material can now be loaded from an .mtl file.
Mesh (POD) should be complete.
Model, especially the function fromFile() is still WIP.
Moved struct Vertex from VertexBuffer.h to its own file Vertex.h, and made necessary changes.
Moved old assets into sub-folders.