Cleaning up some shaders and adding a very basic shader for the cube model
Setting VertexArrays to unbind after working with them so they don't get messed up by other operations that may otherwise change their state if they were bound.
Adding a function to directly load an obj file into a vao and vbo instead of dealing with the model class which still needs a complete re-work
Now drawing two items in the scene, a cube and plane so that I can look into shadowing and lighting effects since I've reached Ch.7 light and shadow in the OpenGL Programming Guide