Added button to select another currency.

[agarzon]

Added button to select another currency. #94
Also fix the redirection the checkout page when order expires. #106

[blockonomics]

We don't need a new button to change currency. We need to fix the fundamental problem of the URL being incorrect. It is required to split the checkout screen into two URLS : currency selection and payment (as in wordpress)

The automatically fixes many problem of payment expiry, going back and other problem of page refresh not working

[agarzon]

We don't need a new button to change currency. We need to fix the fundamental problem of the URL being incorrect. It is required to split the checkout screen into two URLS : currency selection and payment (as in wordpress)

Then the issue is different than the one I opened. Mine was only related with the lack of ability of change the currency once selected and this PR add that missing feature.

In the case of WP is different, there are 2 different pages with two different urls (used to be done years ago before the invention of single page applications).... of course we can do that.

And about the timing, it is just buggy code in javascript which works well in WP and not in WHMCS, (which is actually another different issue). It won't be fixed just because you refresh the page as in WP or having 2 different URL.