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

reformatting at top level

reformat /lib/exe/ folder

reformat lib/exe/mediamanager.php

recover comments in list

manual code style fix

coding style: function call spacing

coding style: loop declaration spacing

coding style: PSR12.Classes.ClassInstantiation.MissingParentheses

address issues mention in PR#4045

prepare for merging

removed WIP marker and changed the branch to master

codestyle adjustments: PHP constant casing

codestyle adjustments: EOF new lines

codestyle adjustments: function declaration braces/spaces