Rendering engine

[Martysh12]

We need a rendering engine with support for custom colours, textures (in the future), property-based colours, and so on.

• [ ] Render engine
  1. • [x] Colors
       • [x] Custom colors
       • [x] Property-based colors
  2. • [x] Rendering rectangles
  3. • [ ] Rendering N-gons
  4. • [ ] Full texture support (#11)

[smileyface12349]

@Martysh12 I've pushed a partially complete version of texture storing, which has the rendering built in to the class. I'm wondering if you want to continue this as it's basically rendering, just contained within the texture.

In BoxState, you still need to do some checks (e.g. checking it's on the screen) and handle TRANSPARENT appropriately, but otherwise it can simply be rendered from the list returned from .render()

Still needs to be done:

• Support for shapes other than rectangles
• Rendering VariableTexture (this is the best solution I thought of to allow variable size and orientation - go ahead and completely change it if you think of something better)
• Definitely some testing / code review
• Property based textures?
• Probably more, I haven't done this super thoroughly

I'm very happy to work together on this if you'd like me to, just let me know what you want me to do.