Fix error on platforms that require 16 byte aligned uniforms such as WebGL.

src/outline.wgsl

@@ -6,14 +6,17 @@ struct VertexInput {
 };
 
 struct OutlineViewUniform {
+    @align(16)
     scale: vec2<f32>,
 };
 
 struct OutlineVertexUniform {
+    @align(16)
     width: f32,
 };
 
 struct OutlineFragmentUniform {
+    @align(16)
     colour: vec4<f32>,
 };
 

src/uniforms.rs

@@ -17,11 +17,13 @@ use crate::{pipeline::OutlinePipeline, Outline};
 
 #[derive(Clone, Component, ShaderType)]
 pub struct OutlineVertexUniform {
+    #[align(16)]
     pub width: f32,
 }
 
 #[derive(Clone, Component, ShaderType)]
 pub struct OutlineFragmentUniform {
+    #[align(16)]
     pub colour: Vec4,
 }