Feature: "Only show/hide in Hammer" selection for visgroups.

[Trico-Everfire]

Which component should be improved?

Hammer

Describe your feature suggestion in more detail

Hammer allows you to hide and unhide visgroups. But hiding/unhiding visgroups is done globally. Meaning VBSP does not see hidden visgroups. In sense, this is good, because it'll allow you to hide away unneeded stuff. However, what would be nice to have is the added option to choose if you hide it globally, only hide it for VSBP or only hide it in Hammer. This would be akin to Blender's object options where you can choose to hide things from the renderer/viewport/selectionboard/globally without affecting the selected options. This would allow for stuff like a blockout that only shows in Hammer but never compiles to map. It would be a QoL feature that'd be highly appreciated.