New node: Solidify Stroke (#1650)

* added struct and registered fill from stroke node. not functional yet.

* properly registered new node

* finished fill-from-stroke feature. works on both closed and open shapes. supports line caps and line joins.

* fixed import issues and miter limit handling

* fix outline function. use both subpaths for solid shapes now

* code quality improvements

* use radius instead of diameter, functionality not yet working for shapes as transform is not properly applied before calculating new shapes.

* Updated to follow new VectorData structure. Fully functional.

* fix repeat node

* remove comment

* add a test, remove unused code.

editor/src/messages/portfolio/document/node_graph/node_graph_message_handler/document_node_types.rs

@@ -2617,6 +2617,15 @@ fn static_nodes() -> Vec<DocumentNodeDefinition> {
 			properties: node_properties::node_no_properties,
 			..Default::default()
 		},
+		DocumentNodeDefinition {
+			name: "Solidify Stroke",
+			category: "Vector",
+			implementation: DocumentNodeImplementation::proto("graphene_core::vector::SolidifyStrokeNode"),
+			inputs: vec![DocumentInputType::value("Vector Data", TaggedValue::VectorData(graphene_core::vector::VectorData::empty()), true)],
+			outputs: vec![DocumentOutputType::new("Vector", FrontendGraphDataType::Subpath)],
+			properties: node_properties::node_no_properties,
+			..Default::default()
+		},
 		DocumentNodeDefinition {
 			name: "Repeat",
 			category: "Vector",