fix numeric expression read in plugin default conf FS#2888

comment improvements

fix signatures and old by references

fix php strict notices

Fix CodeSniffer whitespace violoations

Removed extraneous whitespace to eliminate errors reported by the
Squiz.WhiteSpace.SuperfluousWhitespace sniff.

Fix CodeSniffer violations for PHP files

Fix violations for Squiz.Commenting.DocCommentAlignment.SpaceBeforeTag

Conflicts:
inc/parser/xhtml.php

Fix CodeSniffer violations for PHP files

Fix violations for Generic.PHP.LowerCaseConstant.Found

Fix CodeSniffer violations

Change indentation to ensure code confirms to CodeSniffer rules.

Revert "add html5 attributes to email fields of the config manager"

This reverts commit 0d21c87f31bb8931973f720c04346bf5f8612470.

update config metadata comments for parameter '_multiple'

add html5 attributes to email fields of the config manager

FS#2751 - self deletion of user account

Remove search_references() and the refshow configuration option

The refshow configuration option wasn't used as described anymore
already in the latest release and after the introduction of the medi

Remove search_references() and the refshow configuration option

The refshow configuration option wasn't used as described anymore
already in the latest release and after the introduction of the media
usage index the parameter is also no longer relevant for internal
optimization. The only place where it was still used is the no longer
used search_references()-function which is removed here, too.

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fix security caution for 'remote' setting (was 'xmlrpc')

replace preset _cautionList property with _caution config metadata parameter, plugins can now easily set cautions on their settings

fix security caution for 'remote' setting (was 'xmlrpc')

FS#2722 add settings_regex class, use it for hidepages

remove no longer used email pattern, validation is done by mail_* functions

remove php_strip_whitespace() alternate, no longer required as php min req't ensures its always present

add comments for recent settings class additions to extra.class.php

removed a bunch of functions which were deprecated in 2005/2006

improve comments on settings::update() method

tidy up authtype setting class (incl. fix issue with auth change/logoff occurring when only one auth plugin is enabled and other settings are updated)

add property to show disabled plugins, set it to false (to hide by default)

separate default settings from non-existing settings
setting type read from metadata eqaul to empty string is default 'setting' class (a textarea), everything else should be a existing class otherwis

separate default settings from non-existing settings
setting type read from metadata eqaul to empty string is default 'setting' class (a textarea), everything else should be a existing class otherwise 'setting_no_class' is loaded

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