Added filtering by window title regex to blacklist and whitelist

[olegtarasov]

Full disclosure: I vibecoded this feature with Codex from OpenAI.

I encountered a problem while using JankyBorders with JetBrains IDEs: tooltips windows get a border. This is not a desired behavior for me, especially when hovering on filenames in project explorer:

So I really needed some kind of way to blacklist only certain windows, not the entire app. Filtering by window title regex looks like a solution to this problem, so I tried to add this feature while preserving backward compatibility.

Now several rules can be specified for both blacklist and whitelist. If there is only the app name, the filter behaves like before. But you can also specify multiple rules for a single app with additional regex filters for window title, like this:

borders style=round width=10 hidpi=on active_color=0xffd36151 inactive_color=0x00000000 blacklist="clion:^$"

This example fixes the problem that I had with JetBrains IDEs:

EDIT: After completing the PR, I looked at other PRs in this repo and found another solution for JetBrains IDEs :) Well, regex filtering still looks like a useful feature, so I'll leave my PR for your consideration as well.