wip: Changes of the week

- Move engine to a different crate
- Add engine trait
- Refactor the rest of the codebase to work with these changes
- Add debug ui buffer, use it to finish imgui support

glium_platform/src/system.rs

@@ -1,23 +1,26 @@
 use std::cell::RefCell;
 use std::rc::Rc;
-use raidillon_core::Scene;
+use raidillon_core::scene::Scene;
 use glium::{Display, Frame};
 use glium::glutin::surface::WindowSurface;
 use indexmap::IndexMap;
 use raidillon_assets::ModelManagerRef;
+use raidillon_core::DebugUIBuffer;
 use crate::GliumAssetManager;
 
 pub struct RenderingContext<'a> {
     pub scene: &'a Scene,
     pub target: &'a mut Frame,
+    pub window: &'a mut glium::winit::window::Window,
     pub asset_manager: ModelManagerRef,
+    pub debug_ui_buffer: Rc<RefCell<DebugUIBuffer>>,
 }
 
 /// The internal "rendering system" trait of glium_platform.
 /// This is unrelated to the main System trait in core.
 pub trait RenderingSystem {
     fn render(&mut self, ctx: &mut RenderingContext);
-    fn initialize(display: &Display<WindowSurface>) -> Self where Self: Sized;
+    fn initialize(display: &Display<WindowSurface>, window: &glium::winit::window::Window) -> Self where Self: Sized;
 }
 
 pub type SystemID = &'static str;