Interior Water Plane Fixes

This mod contains fixes for various interior water planes, most notably the Ruby Hill Mine and the Vault 3 - Living Quarters, both of which suffer from issues where the water suddenly disappears while players are underwater, which makes it look like they're swimming through the air.

In case of the Ruby Hill Mine, this is almost always repeatable when coming from the lower tunnel, where the water disappears just as players enter the larger section of the cave. That's also what's shown in the screenshot. And in the case of Vault 3, the issue happens in one of the tunnels when leaving the room at the end, which in the vanilla game contains a different water plane than the tunnel itself.

How did I fix that? By replacing separate water planes with one massive plane, and forwarding all the refracting references to it. And that appears to fix the issue in every single case.