php7 syntax fix.
https://forum.dokuwiki.org/thread/15725
https://forum.dokuwiki.org/post/58606

This should make their purpose more obvious.

This add some search assistance to simple, single-word search queries
which may be restricted to a single namespace.

Further improvements:
* better styling
* trigger events for other plugins
* set namespaces directly from fulltext search results
* some more config options

I'm not sure that setting the constants in template.php is the best
place. However if we set them in doku.php, we have to duplicate it in
lib/exe/mediamanager.php and lib/exe/detail.php, which is not ideal as
well.

Add Event to modify the list of javascript files before they are processed. This allows plugins to not have their - or other plugins - script delivered to the client. Creating the list of files upfront might add a little overhead which I think is OK when you can be certain that only JavaScript that really is needed will be delivered to the client.

Multiple Javascript requests, e.g. to only send the jQuery part or just editor/administrator scripts, could be implemented with this modification (I know, jQuery has already been split).

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.

While Browsers (IE of course) still fail to accept the correct
application/javascript mimetype in the type attribute of the script
element, we should serve the scripts with the correct Content-Type
header at least. This is especially important as the default
configuration of mod_deflate expects application/javascript and will not
compress text/javascript.

In an older version of PHP a file_exists() call would issue a warning
when the file did not exist. This was fixed in later PHP releases. Since
we require PHP 5.3 now, there's no need to supress any error here
anymore. This might even give a minor performance boost.

Added user*.less files to config

Fixed JavaScript compression. The compressor did not recognize a regular expression after a '&&' ot '||' operator. So it could happen that code had been cut off if the regular expression included '\//' (which was treated as a single line comment because of the regular expression not being recognized). Finally fixes #897.

the second include was never removed, causing an endless loop.

source maps are invalid for our dispatched sources and may even cause
problems. this makes sure any sourcemap declarations are stripped from
the output

Fixes FS#2837

Fix violations for the following sniff
DokuWiki.Functions.OpeningFunctionBrace

Also removed an extraneous semicolon.

When debugging is enabled (allowdebug enabled) JS errors are now catched
for each non-core JS file and logged with the additional information
from which file they came. This should make it easier to find out which
plugin is the cause for broken JS code. The feature isn't enabled by
default as defining functions inside try-clauses isn't allowed in strict
mode and causes a warning at least in Firefox.

this disables the JavaScript compatibility layer which let pre-jQuery
migration plugins run with their old code.

This will break plugins using outdated JavaScript. These plugins have to
be updated according to https://www.dokuwiki.org/devel:jqueryfaq

As a courtesy to users, the compatibility.js is not deleted, yet.
Undoing this single patch can be used as a temporary workaround.

this will be removed soon again. plugins using jQuery should make sure
they are compatible to jQuery 1.9

* jQuery 1.9.0
* jQuery-UI v1.9.2
* jQuery.fn.live > jQuery.fn.on
* jQuery.fn.browser replacement (jquery.mb.browser.js)

This simplifies a while loop in the js_compress() code. The
functionality of the new code is completely identical to the old code
but it uses less comparisons and according to FS#2593 it is thus a lot
faster.

See
http://stackoverflow.com/questions/805107/how-to-create-multiline-strings
for info on them.

This removes the cachekey parameter again and instead follows
@michitux's suggestion to trigger an event for the cache usage