Don't use a data-url

Pass the SVG to the editor, using
  editor.svgCanvas.setSvgString(selected);
instead. (Suggested by Jeff Schiller)
Fix a bug with line and freehand tools caused
by activating foreignObject tool. (Again, fix
due to Jeff)
Sync with SVG-Edit.

public/svg-edit/editor/svg-editor.js

@@ -624,7 +624,8 @@ function svg_edit_setup() {
 
 	// updates the toolbar (colors, opacity, etc) based on the selected element
 	var updateToolbar = function() {
-		if (selectedElement != null && 
+		if (selectedElement != null &&
+            selectedElement.tagName != "foreignObject" &&
 			selectedElement.tagName != "image" &&
 			selectedElement.tagName != "g")
 		{