Right now the main goal is cleaning up the code, creating the modules, finishing some basic interface and getting a minimal project working.
Development will then consist in developing an example game (a kingdom rush clone?) and adding features as needed developping both in parallel.
Once a reasonable set of features are implemented work on a "real" game and refine the engine as the game demands it.

TODO (general) :
    - Reorganise all files
    - Make modules out of the relevant parts
    - Get minimal project working
    - Add support for textures
    - Lighting
    - make a demo repo for trying things out

TODO (precise steps) :
    - use mouse to rotate camera
    - Figure out a way for scene to be able to load all its unloaded game objects at once
    - make game draw the scenes in self.scenes

File organisation:

   - component.rs, logic and traits related to components

   - camera.rs, camera struct and basic functions

   - game_object.rs

   - game.rs, game struct
      -- Game::run() is the main loop of the game

   - graphic_component.rs 
      -- object model struct
      -- graphic compoenent struct
      -- load model and shader functions

   - fps_camera_controller.rs, allows for an fps camera controller
      -- TODO should not be in base project, but is useful for testing

   - input.rs, handles input
      -- keeps track of the keyboard state
      -- TODO mouse state

   - main.rs, main

   - scene.rs
      -- draws its objects
      -- TODO current assumption that each go has at most one gc

   - transform.rs, transform struct and rotation related functions


Interface:

Creating a go, scene and showing them on screen:
   - create new game
   - create new scene
   - create graphic component
      -- requires shaders (vertex and fragment)
      -- requires model
   - add model and shader to gc
   - create go
   - add graphic component to go in scene
   - add go to scene
   - add scene to game
   - run