message: add 'read' methods for Unsigned textures too
diff: @@ -899,7 +899,7 @@ fn build_texture<W: Write>(dest: &mut W, ty: TextureType, dimensions: TextureDim
  // writing the `read` functions
  // TODO: implement for other types too
  if dimensions == TextureDimensions::Texture2d &&
  - (ty == TextureType::Regular || ty == TextureType::Srgb || is_compressed)
  + (ty == TextureType::Regular || ty == TextureType::Srgb || ty == TextureType::Unsigned || is_compressed)
  {
  (write!(dest, r#"
  /// Reads the content of the texture to RAM. This method may only read `U8U8U8U8`
  