Hide pfUI panels when Bagshui is on top

[veechs]

What will your feature request solve?

When Bagshui is above a pfUI chat panel and the background is fairly transparent, things can be difficult to read.

Describe the solution you'd like

Intelligently hide the pfUI chat panel when a Bagshui window overlaps it.

Describe alternatives you've considered

Changing the Bagshui background color to remove transparency.

Additional context

Requested here.