Lay groundwork for adaptive resolution system (#1395)

* Make transform node accept footprint as input and pass it along to its input

use f32 instead of f64 and add default to document node definition

* Add cull node

* Fix types for Transform and Cull Nodes

* Add render config struct

* Add Render Node skeleton

* Add Render Node to node_registry

* Make types macro use macro hygiene

* Place Render Node as output

* Start making DownresNode footprint aware

* Correctly calculate footprint in Transform Node

* Add cropping and resizing to downres node

* Fix Output node declaration

* Fix image transform

* Fix Vector Data rendering

* Add concept of ImageRenderMode

* Take base image size into account when calculating the final image size

* Supply viewport transform to the node graph

* Start adapting document graph to resolution agnosticism

* Make document node short circuting not shift the input index

* Apply clippy lints

document-legacy/src/layers/layer_layer.rs

@@ -17,6 +17,7 @@ pub enum CachedOutputData {
 	BlobURL(String),
 	VectorPath(Box<VectorData>),
 	SurfaceId(SurfaceId),
+	Svg(String),
 }
 
 #[derive(Clone, Debug, Default, PartialEq, Deserialize, Serialize)]
@@ -91,6 +92,7 @@ impl LayerData for LayerLayer {
 					id
 				);
 			}
+			CachedOutputData::Svg(new_svg) => svg.push_str(new_svg),
 			_ => {
 				// Render a dotted blue outline if there is no image or vector data
 				let _ = write!(