removed implementation of _getcsv() in usermanager

Our minimum PHP version requirement is now over 5.3, so this workaround is
not needed anymore. See also c9454ee3a82b29418a7ee59f0bb35006ea6a7fb1

removed deprecated changelog functions getRevisionInfo() and getRevisions() outside of class

removed deprecated cliopts

removed support for deprecated 'default' userstyles

Remove support for .disable in plugin folder

Close #1323

removed unused CSS (since 30fd72fb)

removed CSS support for IE8

removed obsolete vendor prefixes (and fixed broken gradients)

inline small images into the CSS by default

Since we no longer support old IE 8 and below we can enable data uris
by default now. The picked size here is open for discussion.

A typical HTTP header

inline small images into the CSS by default

Since we no longer support old IE 8 and below we can enable data uris
by default now. The picked size here is open for discussion.

A typical HTTP header for a static image ressource is about 200 to 250
bytes at dokuwiki.org. I picked twice of that as the cutoff for inlining
images.

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removed very old left overs from IE7 (and even IE6) support

Fix caching issue in wikiFN

The function wikiFN effectively takes the $clean flag now into account when
caching filepaths and when returning them from cache.

Fixes #1536

correctly handle line breaks in textarea #1312

Textareas use CRLF, but internally we use LF.

fixed typo from nofollow to noopener

vendor prefix plugin namespace

As suggested by @micgro42 the plugin namespace should use a vendor
prefix to avoid name clashes when DokuWiki is integrated with other
software.

correctly check for pageid in tpl_include_page

@scrutinizer-notifier noticed that the $pageid might be false when
page_findnearest looks for it.

less prominent styling of size changes

reusing the diff colors as suggested by @selfthinker

Make cleaning optional in mediaFN, keep as default

As in wikiFN cleaning the id should be optional, but still the default, in mediaFN as well.

translation update

updated GeSHi to v1.0.8.17

copied language files from authmysql

form prefill: honor empty values

when a form was submitted with an empty input, that data should still
overwrite the preset value.

added dropdown type to new Form system #1312

supress lint error on LF signature #1101

use LF instead of CRLF as discussed in #1101

Until we did some more research on compatibility we should stick with
what works, even when the RFC says otherwise.

Should we decide to change line endi

use LF instead of CRLF as discussed in #1101

Until we did some more research on compatibility we should stick with
what works, even when the RFC says otherwise.

Should we decide to change line endings to RFC conform CRLF, it should
be done on the whole body, not the signature only.

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renamed ignoreacl parameter to useacl