egui support

- New Resource, EguiQueue: Utility to queue egui ui builders
- New Rendering System, EguiRenderer: Utilizes a modified egui_glium
  library to render egui UI
- Adjusted RenderingSystem trait and RenderingContext structure to
  provide event_loop and egui_queue.
- Various minor adjusments

engine/Cargo.toml

@@ -11,4 +11,5 @@ raidillon_ecs = { path = "../ecs" }
 winit = "0.30.12"
 hecs = "0.10.5"
 indexmap = "2.10.0"
-glam = "0.30.8"
+glam = "0.30.8"
+egui = "0.33.2"

engine/src/engine.rs

@@ -94,9 +94,4 @@ impl EngineTrait for Engine {
     fn reset_debug_ui_buffer(&mut self) {
         self.scene_manager.current_mut().resources.get_mut::<DebugUIBuffer>().unwrap().reset_buffer();
     }
-
-    // fn scene_and_debug_ui_buffer_mut(&mut self) -> (&mut Scene, &DebugUIBuffer) {
-    //     let (sm, dub) = (&mut self.scene_manager, self.scene_manager.current().resources.get::<DebugUIBuffer>().unwrap());
-    //     (sm.current_mut(), dub)
-    // }
 }