Feature Request: Whitelist support for window swallowing

[dragonfly1033]

I would like to have a whitelist mode for the window swallowing filter. My use case is that I only want window swallowing in a few applications so it would be easier to maintain a small whitelist than a very long blacklist.

In truth I've solved this problem for myself but I think others might benefit from this feature hence why I'm opening this issue. I'll follow up with a PR if you give me the green light 👍 .

p.s. this is my first open source contribution, do let me know if I do something wrong 😄

[dragonfly1033]

I've just seen #151 and it seems like it would solve my issue if merged. I don't know what to do with this information so I'll just leave this comment here.