Update jQuery fancybox, easing and mousewheel for WordPress 5.5 compatibility

[bobbingwide]

In #153 (comment) I documented the results of testing the current version of jQuery Fancybox with WordPress 5.6 and with the new version of jQuery coming in 5.6
It's time to update.

Requirements

• update jQuery files without affecting users of them - i.e. any invocation in [bw_jq] shouldn't need to be changed
• new code should work with WordPress 5.5 without jQuery Migrate
• new code should work with jQuery 3.5.1 ( expected in WordPress 5.6 ) without jQuery Migrate
• don't worry about earlier versions of WordPress

Proposed solution

Having looked at easy-fancybox it looks like I need to update the following

jQuery file	From	to at least
fancybox	1.3.4	1.3.24
easing	1.3	1.4
mousewheel	3.0.4	3.1.13

or even higher versions such as https://github.com/fancyapps/fancybox

[bobbingwide]

I chose the easy-fancybox approach.

• I copied the jquery files ( debuggable and .min versions)
• I then added some logic to map old script file names to the new ones
• I also copied the CSS file(s) and changed the CSS a bit to load images from the same directory... as this was how it was in the earlier version.

Testing the examples on sb/oikcom I found that some of the fancyboxes which were originally displayed as iframes no longer worked. The fancybox jQuery code displayed "

I found I needed to add type=iframe to the bw_jq shortcode.
I some cases I needed to duplicate the shortcode to improve the selector. e.g.

[bw_jq "div.gallery a" fancybox script=fancybox-1.3.4 debug=true ]
[bw_jq ".iframe div.gallery a" fancybox debug=true type=iframe]
[div class="w60p3"]
[gallery link="file" ids="8886,8905"]
[div class=iframe]
[gallery link="post" ids="8886,8905"][ediv][ediv]

Notes

• debug=true forces the use of the debuggable jQuery files.
• I'm not sure where easing and mousewheel are used, if at all.
• The examples need updating with better documentation
• The code works for all combinations of jQuery and jQuery Migrate

[bobbingwide]

don’t close this until documented

[bobbingwide]

Note: Fancybox v3 ( 1.3.24 etc) is discontinued. See http://fancybox.net/howto
It's been replaced by Fancybox v4 which doesn't use jQuery.