upgrade to phpstan 2.0

Full Changelog: 1.2.3...2.0.0

1.2.3

fix rules

1.2.2

fix phpcs

1.2.1

css

1.2.0

bump version

Min PHPStan version

1.1.3

mix phpStan required

1.1.2

add spaze/phpstan-disallowed-calls extension and rules

bump php 8.0

1.1.1

bump ergebnis/phpstan-rules

1.0.1

move to src, make auto install script and remove duplicatates

PSR-12, PhpStan 0.12

1.0.0

add psr12 and bump phpStan to ^0.12