Dispatch custom event when user accepts the policy

[a6software]

Copy of upstream PR - trewknowledge#245

Dispatch a custom event so we can do "interesting things" from elsewhere when the user accepts the policy.

In my example I want to redirect the user to the same page, but with a cache buster on the end of the URL:

jQuery( document )
	.on(
		"updatedPrivacyPreferences",
		function() {
			"use strict";

			var current_url = encodeURI( window.location.href );
			var qs_concat = current_url.indexOf( "?" ) > -1 ? "&" : "?";

			window.location = encodeURI( current_url + qs_concat + "ts=" + new Date().getTime() );
		}
	);

[jenkoian]

Minor prefer single quotes as per the existing style of this file.