Make is_ssl and baseurl use proper proxy checks

This should not only address #4455 but also ensures that the related
headers are only used when they come from a trusted reverse proxy chain.

Merge pull request #4389 from dokuwiki/buildquery

use http_build_query() in buildURLparams()

�� Rector and PHPCS fixes

use renamed trustedproxies setting in tests

style fix

Merge branch 'pr/3815' into clientIP

* pr/3815:
Move IP functions into a class
Factor out IP address functions; all proxies must be trusted
Fix clientIP() returning the wrong address

use http_build_query() in buildURLparams()

buildURLparams() is used all throughout the code, but its implementation
was overly simplistic. This changes it to use the much better builtin
http_build_q

use http_build_query() in buildURLparams()

buildURLparams() is used all throughout the code, but its implementation
was overly simplistic. This changes it to use the much better builtin
http_build_query() function. This allows for correct encoding of array
values or deeper nested structures.

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�� Rector and PHPCS fixes

replace deprecated utf8_encode #4354

change use order for codesniffer happyness

�� Rector and PHPCS fixes

Replace strftime with Intl ICU. Fixes #3573

This uses a class that maps strftime placeholders to the appropriate ICU
patterns. I am using the fallback-intl branch here which provides an
English-only

Replace strftime with Intl ICU. Fixes #3573

This uses a class that maps strftime placeholders to the appropriate ICU
patterns. I am using the fallback-intl branch here which provides an
English-only fallback when the intl extension is not available.

Core has only two places where strftime is used: dformat() and the
SimplePie feed parser. Both are adjusted with this patch. For the latter
a custom Item class had to be registered. For better separation all our
FeedParser classes have been moved to the Feed namespace where our
FeedCreator classes already reside.

Note that this will currently be a degration for users without intl as
it will fall back to date and not to the still available strftime.

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Fix undefined array key warning

Fix style error

Use str_starts_with/str_ends_with

use $auth instanceof AuthPlugin instead of not null check

unused items, phpdocs

code style: line breaks

code style: operator spacing

code style: control structure fixes

code style: indent fixes

deprecate ptln()

This method was used to ensure some basic readability in the created
HTML sources long before Firebug and later the builtin inspector tools
in browsers pretty printed the HTML for y

deprecate ptln()

This method was used to ensure some basic readability in the created
HTML sources long before Firebug and later the builtin inspector tools
in browsers pretty printed the HTML for you. Today, this is no longer
needed.

This adds a custom rector rule to automatically change all occurances to
echo statements.

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coding style: control flow line breaks

coding style: control flow whitespaces

coding style: function call spacing