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/Cargo.toml

@@ -49,6 +49,7 @@ rand = { workspace = true, default-features = false, features = ["std_rng"] }
 glam = { workspace = true, default-features = false, features = [
 	"scalar-math",
 ] }
+serde_json = { workspace = true }
 
 # Required dependencies
 half = { version = "2.4.1", default-features = false, features = ["bytemuck"] }