- ACL's hand-written template doesn't use div.content to wrap the footnote content
- jQuery object existence check should use $obj.length

Safari 9 in iOS does not support the use of `const` in strict mode. Unfortunately, some of us are stuck with Safari 9 due to not being able to upgrade.

I am a big fan of progressive enhancement, but because all javascript code is packed together and sent off to the client, this small incompatibility breaks all javascript for safari 9 browsers. Switching these two keywords makes everything work again.

There are no other uses of `const` in the codebase as far as I can find. This change has little to no impact on anything else, but slighlty extends the range of supported browsers.

Plugins may want to add further fields to be present when saving drafts.
Plugins may want to execute some js functionality that should be timed to
the saved draft/refreshed lock.

If a plugin does another init() to attach the dw_locktimer to its own editor,
then the default callback would be added a second time, causing unexpected
and undesired behavior.

This includes the changes from the following commits:
6ef45cc1
6ca947f3
0fff419c
87bed8b6

This removes a lot of reudundant CSS classes in favor of cascading
selectors. Styling isn't done, yet this is just a first step.

Still to do:

* aria labels
* styling the toggle mechanism
* RTL styling
* making sure everything displays correct when no JS is available
* translations may be missing
* refactoring the rest of search.less to make use of LESS features

This functionality is inspired by what other large search engines are
doing.

This simplifies many aspects. However, it still needs much better
styling.

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

If it's already inside an image tag, move the cursor to the end of the current tag.

The check did not work any more. see #1853

The file had 0 bytes before (starting from
5928c8e7) - probably something went
wrong while executing update.sh.

this also removes the non inified versions and incorporates some updates
the jquery CDN just pushed for jquery-ui

jQuery.browser no longer exists in jQuery nor in jQuery migrate. A quick
check in Opera and IE11 suggests that both parts that used it are no
longer needed so they were simply removed.

More browser tests especially for the resize handling in the media manager
are recommended.

The bind() call is deprecated in jQuery 3. This replaces it with
the on() call.

The delegate() call is deprecated in jQuery 3. This replaces it with the
on() call.

jQuery UI replaced the buttonset widget with a controlgroup widget. This
adjusts the JavaScript and styling accordingly.

- jQuery to 3.1.1
- jQuery UI to 1.12.1
- jQuery Migrate to 3.0.0

There are a few warnigs from migrate that have to be fixed. The toggles
in the Media Manager are also missing their proper icons.

checkfunc is mainly replaced by doku_hasTextBeenModified, which is put
in  global scope to allow overriding by plugins.

- if #wiki__text (the default DokuWiki editor field) exists, the
checkfunc() checks whether the field content is changed
- if #wiki__text not exists it assumes that on all change and keydown
events the content of the form #dw__editform is changed (give still
false positives.) (for example the Data plugin has none #wiki__text)

Fixes #1483

Fixes #1199