use a fixed import for canvg

dist/editor/system/extensions/ext-php_savefile.js

@@ -1,41 +0,0 @@
-System.register([], function (exports) {
-  'use strict';
-  return {
-    execute: function () {
-
-      // TODO: Might add support for "exportImage" custom
-      //   handler as in "ext-server_opensave.js" (and in savefile.php)
-      var extPhp_savefile = exports('default', {
-        name: 'php_savefile',
-        init: function init(_ref) {
-          var $ = _ref.$;
-          var svgEditor = this;
-          var extPath = svgEditor.curConfig.extPath,
-              svgCanvas = svgEditor.canvas;
-          /**
-           * Get file name out of SVGEdit document title.
-           * @returns {string}
-           */
-
-          function getFileNameFromTitle() {
-            var title = svgCanvas.getDocumentTitle();
-            return title.trim();
-          }
-
-          var saveSvgAction = extPath + 'savefile.php';
-          svgEditor.setCustomHandlers({
-            save: function save(win, data) {
-              var svg = '<?xml version="1.0" encoding="UTF-8"?>\n' + data,
-                  filename = getFileNameFromTitle();
-              $.post(saveSvgAction, {
-                output_svg: svg,
-                filename: filename
-              });
-            }
-          });
-        }
-      });
-
-    }
-  };
-});