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allow selecting the preferred CDN and add event

We now have two CDNs available. code.jquery.com which is the more
popular one and CDNjs which is the faster one. Plugin authors can use a
plugin hook

allow selecting the preferred CDN and add event

We now have two CDNs available. code.jquery.com which is the more
popular one and CDNjs which is the faster one. Plugin authors can use a
plugin hook to easily implement their own preferred CDN. Authors might
even use this event to conditionally load additional JavaScript files.

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split off jquery from other JS and add CDN option #1766

jQuery (and UI and Migrate) are now loaded separately from the rest of
the JavaScript. This adds at least one HTTP request more but has some
a

split off jquery from other JS and add CDN option #1766

jQuery (and UI and Migrate) are now loaded separately from the rest of
the JavaScript. This adds at least one HTTP request more but has some
advantages:

* browsers can cache it independently
* the cache is only invalidated when versions update
* we do not apply any transformations (replacements, minimizing, etc) on
this code anymore which makes our dispatcher faster for the other JS
* browsers seem to load (not execut) both (jquery and other) parallel,
which might increase download speed a bit

This split allowed for the introduction of a new config: jquerycdn. When
enabled the 3 jquery files are loaded from jQueries CDN. This adds
another two HTTP requests but:

* since it's another host those files do not apply to the 4 request per
host limit and can be loaded (not executed) in paralell which might
increase download speeds a bit
* the CDN is distributed worldwide which means files are requested from
the closest location, increasing the download speeds
* since these files/CDN are very popular, chances are high that people
already have them cached in their browsers, reducing the download time
to 0 and effectiely halving the javascript needed to download

The option currently defaults to 'off', but I would argue 'on' would be
the better default.

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