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: multi statements

code style: line breaks

code style: static visibility

code style: operator spacing

code style: inc/dec spacing

code style: control structure fixes

added rectors for new polyfills

We can use the PHP8 rector classes for the polyfills introduced in
a4c648fffdf5bc5db83c9aa9c6c4bf5fb5edc85f

code style: indent fixes

Rector to rename print to echo calls

polyfills for str_(starts_with|ends_with|contains)

code style: ptln removed, useradmin cleanup

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

catch JSON decode exception

coding style: control flow whitespaces

fix abstract declaration of ChangeLog::getFilename()

update some plugin classes in phpdocs, reformatting

update urls and simplify regexp