explicitly track known config files, gitignore the rest

fixes #4308

line break pre when printing. fixes #4424

Add experimental tree builder classes

These classes provide mechanisms to build a traversable tree of pages
and links. Either from the existing namespace structure, or from a
control page containing

Add experimental tree builder classes

These classes provide mechanisms to build a traversable tree of pages
and links. Either from the existing namespace structure, or from a
control page containing (possibly a nested) set of links.

The nodes returned by the tree are deliberately sparse. No ACL checking
is taking place. Developers can enrich (or omit) nodes and influence
recursion decisions via callbacks.

The tree can optionally be sorted by comparators provided in the
TreeSort class or a custom callback.

The API provided by these classes is not considered stable yet and may
change over time. Plugin authors are encouraged to use them and provide
feedback.

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updated dev dependencies

removed dev suggestions from composer file

Those are now specified in the _test composer file.

API doc block updates

increased API version

API: proper access to the current media revision

Even when the revision is explictly given instead of set to 0. See #4419
for ponderings about why this is necessary and a different approach.

Added API endpoint core.getMediaHistory #4147

squashed commits of #4369

updated jquery and jquery-ui versions

set crossorigin header for manifest. fixes #4322

To summarize the issue:

1. the wiki is protected by Basic auth, outside of the wiki
2. chrome will not pass authentication credentials when accessin

set crossorigin header for manifest. fixes #4322

To summarize the issue:

1. the wiki is protected by Basic auth, outside of the wiki
2. chrome will not pass authentication credentials when accessing a
linked manifest
3. the webserver will deny access to the manifest

DokuWiki does not care about the auth credentials, because the manifest
returns public info only. The issue is really with the webserver
denying the request.

Using a crossorigin hint will work around the chrome behaviour. The only
potential downside would be that chrome now will send auth credentials
even when there is no web server based auth. Since DokuWiki doesn't care,
it's not really a downside.

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do not check for deprecated functions in installer

our UTF-8 fallbacks should not fall back on the utf8_decode/encode
functions anymore, so this check is no longer useful

sligthly related to #4354

authldap: avoid warning on invalid mapping setup. #4399

updated php-cli #4384

fix legacy XMLRPC call dokuwiki.appendPage #4418

treat getallheaders more suspiciously. fixes #4415

do not return zero error code for API exceptions. fixes #4413

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allow dialogs overflow in y-direction

In the dokuwiki template, an overflow:hidden was meant to keep oversized
content within the article area. However this can interfere with
pseudo-dropdowns on ve

allow dialogs overflow in y-direction

In the dokuwiki template, an overflow:hidden was meant to keep oversized
content within the article area. However this can interfere with
pseudo-dropdowns on very small pages.

This changes the behavior to clip on x-axis only while keeping overflows
visible in the y direction.

This fixes a rare issue and should not have any effects on normal use
anyway.

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