Simple Editor improvements

Improvements to the Simple Editor including enhancements to saving the current message as a template, new thumbnail previews within the Simple Template and Simple Row libraries, along with various bug fixes.

Mobile In-app and Inbox link tracking enhancements

Added support to track clicks on schema links (cordial://activity). Setup the custom schemas on the Account Settings page, Custom Trackable URL Schemas panel. Only links with registered schemas will be tracked. Clicks will appear on the Link Performance panel of the Message Performance page.

JavaScript Listener Enhancements

Enhanced the JavaScript Listener error messages in Account Monitor.