Ray tracer

Basic ray tracer. Currently supports:

• Phong lighting model
• Specular-specular reflections
• Point lights

To-do list:

• Refactor the code
  • Move to Rust (no real reason other than easier OOP probably?)
  • Implement as trait + methods
• Add spatial hashing to objects (if I decide to support large enough scenes)
• Add different lighting model (Cook-Torrance maybe)
• Add refractions/transparency
• Run it on gpu
• Make it real-time