set DOKU_INC in rector

I had several cases where rector failed to work on plugins without this.
I'm not 100% sure why, but it doesn't hurt to set this early.

skip buggy rector rule

see rectorphp/rector#8916

skip two more rules from rector

update rector to 1.2

Some of our skipped rules no longer exist or apply. Next auto-cleanup
should be checked extra careful

disable RemoveUnusedConstructorParamRector

At least until rectorphp/rector#8580 is fixed

tune parallel tasks in rector

The default options for running paralell rector tasks changed in 0.19
resulting in failures on github runners.

See also https://github.com/rectorphp/rector/issues/8396

update rector

Upgrade rector to 0.18.12

Two classes in DokuWiki's skip rules were removed from rector in 0.18.12

updated devel dependencies

skip CompleteMissingIfElseBracketRector

We like our one-line guardians.

See discussion in
https://github.com/dokuwiki/dokuwiki/pull/4097#issuecomment-1788608355
https://github.com/dokuwiki/dokuwiki

skip CompleteMissingIfElseBracketRector

We like our one-line guardians.

See discussion in
https://github.com/dokuwiki/dokuwiki/pull/4097#issuecomment-1788608355
https://github.com/dokuwiki/dokuwiki/pull/4097#issuecomment-1789826392

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rector env var might be empty -> ignore

allow overriding the minimum PHP release for rector

By setting the environment variable RECTOR_MIN_PHP the supported minimum
PHP release can be set. This is needed to make plugin changes compatible

allow overriding the minimum PHP release for rector

By setting the environment variable RECTOR_MIN_PHP the supported minimum
PHP release can be set. This is needed to make plugin changes compatible
with DokuWiki stable.

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added rectors for new polyfills

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

Rector to rename print to echo calls

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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define custom renames

Automatically rename occurances of deprecated functions and classes.
These renames will come in even more handy when rector is applied to 3rd
party plugins.

Apply rector fixes to bin and toplevel

apply PSR-12 constant visibility rule

PSR-12 says constants need their visibility declared from PHP 7.1
onwards

Apply rector fixes to config plugin

Apply rector fixes to auth plugins

Apply rector fixes to the rest of inc

Apply rector fixes to inc/Parsing

Apply rector fixes to inc/parser

fix sizehandling in Changelog

Seems rector was too aggressive here in removing a variable.

define some more constants

when using bootstrapping, these defines seem not to be auto detected
anymore. We probably have to add a few more once we start running on
plugins.