Vobs sticking through rooms/portals(?)

[Katharsas]

Vobs sticking into velayas room from underneath:

[ataulien]

Happens because of how the portal-culling works in gothic. PB didn't care for objects sticking through the walls because they wouldn't be seen anyways. I reimplemented that mechanism in the Enhanced-Gothic-Renderer project, we may can carry some of the code over.