- 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/jgraduate/jQuery.jGraduate.js

@@ -42,7 +42,9 @@ if (!window.console) {
 }
 
 /**
-* Adds {@link external:jQuery.jGraduate.Paint}, {@link external:jQuery.fn.jGraduateDefaults}, {@link external:jQuery.fn.jGraduate}
+* Adds {@link external:jQuery.jGraduate.Paint},
+* {@link external:jQuery.fn.jGraduateDefaults},
+* {@link external:jQuery.fn.jGraduate}.
 * @function module:jGraduate.jGraduate
 * @param {external:jQuery} $ The jQuery instance to wrap
 * @returns {external:jQuery}