Add colors in Rust (#78)

* 🎨 Add colors in Rust

* 🌿 Use an option for the properties and #[repr(C)]

* ❌ Remove WASM dependency on document.

* 😎 Wrap Fill and stroke in a style struct.

* 📦 Use crate::Color

* Merge Add transactions for temporary modifications to the document

* Run cargo fmt

* Color without a 'U'

client/web/wasm/src/wrappers.rs

@@ -12,8 +12,8 @@ impl Color {
 	#[wasm_bindgen(constructor)]
 	pub fn new(red: f32, green: f32, blue: f32, alpha: f32) -> Result<Color, JsValue> {
 		match InnerColor::from_rgbaf32(red, green, blue, alpha) {
-			Ok(v) => Ok(Self(v)),
-			Err(e) => Err(Error::new(&e.to_string()).into()),
+			Some(v) => Ok(Self(v)),
+			None => Err(Error::new("invalid color").into()),
 		}
 	}
 }