Restrict Content Pro 3.5.45

Fix: Reworking jQuery to cover deprecations.

Fix: Password Reset Form not processing usernames correctly
Fix: Stripe Sources lookup issue occurring when attempting to get the default source from legacy api configurations

-Update: Starting removal of 2Checkout from Restrict Content Pro Core
-Improvement: Making the Stripe Webhook instructions stand out more on the settings page
-Improvement: Adding the trailing slash to Stripe Webhook URL
-Improvement: Remove files that are causing false positives in security scans
-Fix: The Stripe SDK previously replaced the Error class with the Exception class, so core code was updated to match