Initial work migrating vector layers to document graph

* Fix pen tool (except overlays)
* Thumbnail of only the layer and not the composite
* Fix occasional transform breakages
* Constrain size of thumbnail
* Insert new layers at the top
* Broken layer tree
* Fix crash when drawing
* Reduce calls to send graph
* Reduce calls to updating properties
* Store cached transforms upon the document
* Fix missing node UI updates
* Fix fill tool and clean up imports and indentation
* Error on overide existing layer
* Fix pen tool (partially)
* Fix some lints

proc-macros/src/helpers.rs

@@ -4,7 +4,6 @@ use syn::{Path, PathArguments, PathSegment, Token};
 
 /// Returns `Ok(Vec<T>)` if all items are `Ok(T)`, else returns a combination of every error encountered (not just the first one)
 pub fn fold_error_iter<T>(iter: impl Iterator<Item = syn::Result<T>>) -> syn::Result<Vec<T>> {
-	#[allow(clippy::manual_try_fold)]
 	iter.fold(Ok(vec![]), |acc, x| match acc {
 		Ok(mut v) => x.map(|x| {
 			v.push(x);