Summary of a problem or a feature request

In the config file, we should have at least these two placeholders : %rootDir% (directory where phpstan is installed) and %currentWorkingDirectory% (directory from where phpstan is launched).

But it seems they are only supported in parameters section, not the includes section... This could be nice to have at least %rootDir% supported, if you install global dependency / plugins (such as the symfony one), but don't want to clutter the config file (and commit it...) with a personnal value in my case, /home/talus/.composer/vendor/...`).

Code snippet that reproduces the problem

includes:
  - %currentWorkingDirectory%/foo
  - %rootDir%/../phpstan-symfony/extension.neon
  - %rootDir%/../phpstan-doctrine/extension.neon
  - %rootDir%/../../jangregor/phpstan-prophecy/src/extension.neon

Neither %currentworkingDirectory nor %rootDir% are resolved, as phpstan tries to load (let's say I'm triggering phpstan from /home/talus/dev/project) : File '/home/talus/dev/project/%currentWorkingDirectory%/foo' is missing or is not readable. Same thing for the ones with %rootDir%.

Expected output

The files are correctly loaded / included. :}