Fix style error

Use str_starts_with/str_ends_with

replace deprecated ptln call with echo closure

TPL_CONTENT_DISPLAY used ptln() as default action. Since this is
deprecated it needs to be replaced, but since echo is a langage construct not
a real f

replace deprecated ptln call with echo closure

TPL_CONTENT_DISPLAY used ptln() as default action. Since this is
deprecated it needs to be replaced, but since echo is a langage construct not
a real function we need to wrap it into a closure.

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�� Rector and PHPCS fixes

fix syntax plugin loading

It turns out our Syntax plugins never implemented the PluginInterface
(though they did use the PluginTrait). With our stricter type checking
in the plugin loader, these plu

fix syntax plugin loading

It turns out our Syntax plugins never implemented the PluginInterface
(though they did use the PluginTrait). With our stricter type checking
in the plugin loader, these plugins did not longer load.

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�� Rector and PHPCS fixes

siplify isset check

minor cleanup in the renderers

apply code sniffer rules to inc/parser as well

simplify URL linking in handler

indentation fix in media.php

adjust typhints in io_(read|write)WikiPage

current revision is often passed as empty string

simplify is_ssl()

some simplification in getBaseURL after cleanup

don't strict compare

I'm not 100% sure but revs might be strings sometimes, so better not
chage current behavior

remove debug, fix codesniffer

use $auth instanceof AuthPlugin instead of not null check

unused items, phpdocs

https, phpdocs,

return bool for io_mkdir_p()

brackets after if, phpdocs, reformatting

fix comment

code style: line breaks

code style: static visibility

code style: operator spacing