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>

deny.toml

@@ -47,6 +47,7 @@ ignore = [
 	"RUSTSEC-2024-0388", # Unmaintained but still fully functional crate `derivative`
 	"RUSTSEC-2025-0007", # Unmaintained but still fully functional crate `ring`
 	"RUSTSEC-2024-0436", # Unmaintained but still fully functional crate `paste`
+	"RUSTSEC-2025-0014", # Unmaintained but still fully functional crate `humantime`
 ]
 # Threshold for security vulnerabilities, any vulnerability with a CVSS score
 # lower than the range specified will be ignored. Note that ignored advisories