ESLint rules: array-callback-return, no-invalid-this, func-style (#3151)

* satisfied array-callback-return rule
* satisfying no-invalid-this rule
* fixed invalid-this issues
* changed isNotEqual to arrow function
* added rule func-style
* added return false to satisfy array-callback-return rule

Co-authored-by: Joel McKinnon <jmckinnon@apple.com>
Co-authored-by: Joshi <simplyrender@gmail.com>
Co-authored-by: Andrew Henry <akhenry@gmail.com>

platform/framework/src/register/CustomRegistrars.js

@@ -19,6 +19,7 @@
  * this source code distribution or the Licensing information page available
  * at runtime from the About dialog for additional information.
  *****************************************************************************/
+/* eslint-disable no-invalid-this */
 
 /**
  * Module defining CustomRegistrars. Created by vwoeltje on 11/3/14.