Instance tables refactor part 5: unwrap GraphicGroup as multi-row Instance<GraphicElement> tables and move up transforms (#2363)

* Just group

* Partly working but without transforms

* Remove Transform/TransformMut from GraphicElement and GraphicGroupTable

* Fix layers and flattening

* Fix transform group handling on the remaining nodes

* Change collect metadata

* Add transform on vector data. TODO: Remove duplicate transform

* Small code tidying-up

* Add concatenate node?

* Remove ignore_modifications which is always false

* Improve transforms

* Mostly fix the nested transform cage angle (except leaf layers and skew)

* WIP attempt to integrate skew

* Fix nesting bounding box

* Avoid setting the transform

* Fix stroke transforms

* Renderer cleanup

* Fix tests for repeated elements not given unique point IDs

* Suppress cargo-deny warning

* Fix upgrade code for graphic group data

* Work around rendering issue in Isometric Fountain

---------

Co-authored-by: Adam <adamgerhant@gmail.com>
Co-authored-by: hypercube <0hypercube@gmail.com>

node-graph/gcore/src/raster/adjustments.rs

@@ -1583,7 +1583,7 @@ mod test {
 		let opacity = 100_f64;
 
 		let result = super::color_overlay((), ImageFrameTable::new(image.clone()), overlay_color, BlendMode::Multiply, opacity);
-		let result = result.one_instance().instance;
+		let result = result.instances().next().unwrap().instance;
 
 		// The output should just be the original green and alpha channels (as we multiply them by 1 and other channels by 0)
 		assert_eq!(result.data[0], Color::from_rgbaf32_unchecked(0., image_color.g(), 0., image_color.a()));