Give - Currency Switcher 2.1.0

* New: Added compatibility with the Payfast payment gateway.
* Tweak: Improved the notice that displays for currency support per gateway so admins have a clearer understanding.
* Fix: Resolved an issue where changing the currency for a donation form with a goal would adjust the goal.
* Fix: Ensure that the donation level amount respects zero decimal configurations on page load.
* Fix: EUR renewals no longer cause reports to display incorrect amounts.
* Fix: Removed the apostrophe for the thousands separator for the Taiwan New Dollars currency.
* Fix: Ensure that strings displayed on the donation form from currency switcher are translatable.

* New: Admins now have the ability to set the default currency per donation form.
* Fix: The recurring donation amount was not properly being converted when switching to some currencies.
* Fix: Stats could be conflicting when currency switcher is active in the dashboard widget and on reports.

* Important: You must be running Give Core 2.2.0+ in order to use this add-on update. Please update Give Core to the latest version prior to completing this update.
* New: Added an option for admins to enable or disable the option to switch to the users preferred currency.
* Tweak: Use give_get_donation_levels filter to filter the variable amounts after Give 2.2.0.
* Fix: Ensure two decimal places aren't added on conversion and export.
* Fix: Ensure that moving around the donation form levels won't cause errors.
* Fix: Only schedule CRON jobs if automatic updates enabled.
* Fix: Use uninstall.php instead of deactivation hook.