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/shape.rs

@@ -26,7 +26,7 @@ impl LayerData for Shape {
 	fn render(&mut self, svg: &mut String) {
 		let _ = write!(
 			svg,
-			r#"<polygon points="{}"  transform="translate({} {}) scale({} {})" {} />"#,
+			r#"<polygon points="{}" transform="translate({} {}) scale({} {})"{} />"#,
 			self.shape,
 			self.bounding_rect.origin().x,
 			self.bounding_rect.origin().y,