Export current document as SVG when pressing Ctrl+Shift+S (#160)

* Export current document when pressing Ctrl+Shift+S

* Use a blob for download

* Add Ctrl + E shortcut, match on lower case

* Don't mount element in DOM

* Polish some keybindings

* Add initialization for MappingEntries

* Implement svg coloring

* Add newline after svg tag

* Add spaces to svg style format

* Fix more svg formatting

* Add space before />

* Remove duplicate whitespace

core/document/src/layers/ellipse.rs

@@ -25,7 +25,7 @@ impl LayerData for Ellipse {
 
 		let _ = write!(
 			svg,
-			r#"<ellipse cx="0" cy="0" rx="{}" ry="{}" transform="translate({} {}) rotate({})" {} />"#,
+			r#"<ellipse cx="0" cy="0" rx="{}" ry="{}" transform="translate({} {}) rotate({})"{} />"#,
 			rx,
 			ry,
 			cx,