rtiow: break project into multiple workspaces.

rtiow/renderer/src/scenes/mod.rs

@@ -0,0 +1,11 @@
+pub mod bench;
+pub mod book;
+pub mod bvh;
+pub mod cornell_box;
+pub mod cornell_smoke;
+pub mod final_scene;
+pub mod mandelbrot;
+pub mod perlin_debug;
+pub mod spheramid;
+pub mod test;
+pub mod tutorial;