- Refactoring: Avoid unnecessary addEventListener false; change internal

jPicker function to class (used with `new`)
- Linting (ESLint): Add `valid-jsdoc` rule and make fixes; but turn off for
  now due to <https://github.com/eslint/eslint/issues/11036> and
  <https://github.com/eslint/eslint/issues/11037>
- Docs (JSDoc): Add some Markdown for variables, line breaks; tighten checks
  for overly generic types (though allow for `.Function` as in
  `jQuery.Function`) and avoid one previously missed instance

editor/coords.js

@@ -41,13 +41,14 @@ let editorContext_ = null;
 /**
 * @function module:coords.init
 * @param {module:coords.EditorContext} editorContext
+* @returns {undefined}
 */
 export const init = function (editorContext) {
   editorContext_ = editorContext;
 };
 
 /**
- * Applies coordinate changes to an element based on the given matrix
+ * Applies coordinate changes to an element based on the given matrix.
  * @function module:coords.remapElement
  * @implements {module:path.EditorContext#remapElement}
 */