- npm: Alphabetize scripts

- JSDoc: Exclude svgedit config files
- JSDoc: Convert remaining items in old format to JSDoc (as could easily be found)

editor/extensions/ext-markers.js

@@ -103,9 +103,11 @@ svgEditor.addExtension('Markers', function (S) {
     markerTypes[v + '_o'] = markerTypes[v];
   });
 
-  // elem = a graphic element will have an attribute like marker-start
-  // attr - marker-start, marker-mid, or marker-end
-  // returns the marker element that is linked to the graphic element
+  /**
+  * @param elem - A graphic element will have an attribute like marker-start
+  * @param attr - marker-start, marker-mid, or marker-end
+  * @returns The marker element that is linked to the graphic element
+  */
   function getLinked (elem, attr) {
     const str = elem.getAttribute(attr);
     if (!str) { return null; }