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

This drops support for Internet Explorer <9 which we no longer support.

The opera work around is still needed though! O_o

Standardized node.textContent is available since IE9

This makes sure the provided callback is using alphanumerics only. I'm
not sure this is needed, but better safe than sorry.

because we actually want it in this branch ;-)

This reverts commit 38a2174b.

this was an accidental commit to master

This reverts commit f7f7fb6c.

This introduces a mechanism to override what happens when a media item
is selected in the media manager popup by providing a callback name in
the URL. The default implementation just does what
dw_mediamanager.insert did before and calls insertTags()

This change adds a new class to the quicksearch's <form>
element while the quicksearch is running. This is to
make it easier to style the form, e.g. with a throbber gif
in the search box, to indicate that something is happening.
For slow connections, it is sometimes not apparent that
waiting for a few seconds will present the user with a list
of matching pagenames.

The new 'searching' class is added just before the POST
request is sent, and cleared both on successful completion
and when the search box is cleared.

handle 'e' set a resize handle at east side, 'w' at west side.

adds aria handling to makeToggle and allows to supress it in dw_toggle

It is helpful if the pipe is still inserted by the linkwizard when there
is no title. This increases usability for beginners.

When the picker button is near the border of the screen, then an opening panel of picker buttons can go over the screen edge. That's not convenient. So we should add a check in a `function pickerToggle()` and shift picker buttons position if needed.

Add the class .bounce to any element to let it bounce slightly for 2
seconds. This is useful to make the user aware of some element. Can be
combined with #scroll__here when a long list auto scrolls to a certain
item.