JSLoader: Loads External Javascripts

For PGN Chess Flashcards https://ankiweb.net/shared/info/340753088

Card must be tagged as "pgnchess" to activate.

Errors

The template that comes with the shared deck includes an extra white space at the end. This may end up causing problems depending on your version of Anki. As we can not modify the JS to fix this, it is something to be aware of.