Support class bann rules

[staabm]

Would be great if one could also ban single classes or even namespaces.

This is especially usefull when you wanne get rid of a external dependency in which you cannot annotate the classes itself with @deprecated as you dont own the code

If already supported: a example in the readme would be great

[alister]

I can see the benefits of this, such as if it would detect even just use imports. I'm working on a codebase where people still end up adding use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route; though it (and other similar) classes/annotations have been deprecated for a while.

follow-up: It appears that spaze/phpstan-disallowed-calls#51 may be able to support this

[ruudk]

Please try https://github.com/spaze/phpstan-disallowed-calls/tree/v1.3.0 as it supports this now.