Render models using a generic model class.

[Eric-Brown]

Have a class for rendering models. Models should know:

• Materials
• Textures
• Vertexs
• Transformation matrices
• [x] Initialize vertex data and index data from reading file.
• [x] Allow class users to specify when to load vertex and index data to the GPU
• [x] Allow class users to retrieve vertex and index buffer handles when they are loaded.
• [x] Allow class users to specify a texture file to include
• [x] Class allocates texture data to GPU when other model data is loaded

[Eric-Brown]

Last 2 chores (Vulkan.hpp and using Memory manager API, along with creating a single manager class to consolidate the memory logic) were interfering with the ability to move forward here. Should be good now.