Credits API: Prefer HTTPS for External Libraries links

[GaryJ]

Some of the links for the external libraries, as shown on the credits page, use HTTP when the library site also supports HTTPS i.e. ​http://jquery.com is available at ​https://jquery.com. If HTTPS is available, I would expect that to be linked to.

These are the ones I found that could be updated:

• Class POP3 -> ​https://squirrelmail.org
• Color Animations -> ​https://plugins.jquery.com/color/
• Horde Text Diff -> ​https://pear.horde.org (which may be better linked to the more specific ​https://pear.horde.org#horde_text_diff)
• jQuery -> ​https://jquery.com
• jQuery UI -> ​https://jqueryui.com
• jQuery.query -> ​https://plugins.jquery.com/query-object/
• PemFTP -> ​https://www.phpclasses.org/package/1743-PHP-FTP-client-in-pure-PHP.html (though has mixed content warnings)
• TinyMCE -> ​https://www.tinymce.com/ (HTTP redirects to HTTPS anyway)

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Not strictly related, but worth mentioning, is that the jQuery.suggest link is to ​http://plugins.jquery.com/project/suggest, but this redirects to ​http://archive.plugins.jquery.com/project/suggest which is a site that can't be reached. Maybe ​http://polarblau.github.io/suggest/ is a more suitable URL in the mean time, if this is the same package.

[SergeyBiryukov]

Maybe ​http://polarblau.github.io/suggest/ is a more suitable URL in the mean time, if this is the same package.

That's not the same package, but ​https://github.com/pvulgaris/jquery.suggest apparently is.

[coffee2code]

In 3917:

Credits API: Prefer HTTPS for URLs of external libraries, where supported.

Props GaryJ, SergeyBiryukov.
Fixes #1911.