First attempt at a GPU runner

Currently failing with an error I don't understand:

```
wgpu error: Validation Error

Caused by:
  In Device::create_shader_module, label = '...\image_binary.spv'

Shader '...\image_binary.spv' parsing error: InvalidTypeWidth(1)
```

enkou-shaders/src/chaos_game.rs

@@ -106,39 +106,3 @@ impl<'a, R: Rng> Iterator for ChaosGame<'a, R> {
         Some(next_point)
     }
 }
-
-/// Shader entry point for running the chaos game to produce new IFS coordinates
-pub mod entry {
-    use crate::chaos_game::ChaosGame;
-    use crate::rng::xoshiro256starstar_from_seed;
-    use crate::transform::Transform;
-    use crate::variation::Variation;
-    use glam::Vec2;
-    use spirv_std::spirv;
-
-    /// Given a set of fractal flame parameters, generate new IFS coordinates
-    /// and store them in the output array.
-    #[spirv(compute(entry_point_name = "main_chaos_game", threads(1)))]
-    pub fn main_chaos_game(
-        #[spirv(spec_constant(id = 1, default = 20))] iteration_discard: u32,
-        #[spirv(storage_buffer, descriptor_set = 0, binding = 0)] rng_seed: &[u8],
-        #[spirv(storage_buffer, descriptor_set = 0, binding = 1)] transforms: &[Transform],
-        #[spirv(storage_buffer, descriptor_set = 0, binding = 2)] weights: &[f32],
-        #[spirv(storage_buffer, descriptor_set = 0, binding = 3)] variations: &[Variation],
-        #[spirv(storage_buffer, descriptor_set = 1, binding = 0)] output: &mut [Vec2],
-    ) {
-        let mut rng_seed_actual = [0u8; 32];
-        (0..32).for_each(|i| rng_seed_actual[i] = rng_seed[i]);
-
-        let mut rng = xoshiro256starstar_from_seed(rng_seed_actual);
-        let mut chaos_game = ChaosGame::new(&mut rng, transforms, weights, variations);
-
-        for _ in 0..iteration_discard {
-            chaos_game.next().unwrap();
-        }
-
-        for i in 0..output.len() {
-            output[i] = chaos_game.next().unwrap();
-        }
-    }
-}