SVG export (#598)

* first draft of export to SVG. WIP

* enabled text rendeing - which is not quite right atm

* placeholder svg icon

* size the canvas based on the bounding box of elements

* Do not add opacity attributes if default

* render background rect

* Ensure arrows are in the same SVG group

* parse font-size from font

* export web fonts

* use fixed locations for fonts

* Rename export functions

* renamed export file

* oops broke the icon.

src/index-node.ts

@@ -1,4 +1,4 @@
-import { getExportCanvasPreview } from "../src/scene/getExportCanvasPreview";
+import { exportToCanvas } from "./scene/export";
 
 const { registerFont, createCanvas } = require("canvas");
 
@@ -58,7 +58,7 @@ const elements = [
 
 registerFont("./public/FG_Virgil.ttf", { family: "Virgil" });
 registerFont("./public/Cascadia.ttf", { family: "Cascadia" });
-const canvas = getExportCanvasPreview(
+const canvas = exportToCanvas(
   elements as any,
   {
     exportBackground: true,