Replace the image layer type with an Image node (#948)

* Use builder pattern for widgets

* Arguments to new function

* Add node graph when dragging in image

* Fix duplicate import

* Skip processing under node graph frame if unused

* Reduce node graph rerenders

* DUPLICATE ALL frontend changes into other frontend

* DUPLICATE more changes to another frontend

* Code review

* Allow importing SVG files as bitmaps

Co-authored-by: Keavon Chambers <keavon@keavon.com>

document-legacy/src/error.rs

@@ -9,10 +9,9 @@ pub enum DocumentError {
 	IndexOutOfBounds,
 	NotAFolder,
 	NonReorderableSelection,
-	NotAShape,
+	NotShape,
 	NotText,
-	NotAnImage,
-	NotAnImaginate,
+	NotNodeGraph,
 	InvalidFile(String),
 	BooleanOperationError(BooleanOperationError),
 }