Create Object Abstraction class

[George540]

Create Object class so all models, particle systems and other objects are under the same entity with common data, such as buffers, shader and camera setup.

Use polymorphism and inheritance to achieve this level of abstraction.

• Create Object class
• Create primitive data (vertices, indices, etc) file with global access
• Implement in Light class
• Implement in Axis class
• Implement in Grid class
• Implement in Mesh+Model classes
• Implement in ParticleGenerator class
• Implement in Scene class (set up vector of objects with Polymorphism)