Revert "Merge pull request #6298 from Rivet-the-Zombie/stone-walls"

This reverts commit 073f4385157d9ef44574eb01e7ce22edbc93a42f, reversing
changes made to cece08cc8511134718ca1557db14534ff4415cf3.

Nice one.
Merge pull request #6300 from KA101/no-terrain-yet

Revert "Merge pull request #6298 from Rivet-the-Zombie/stone-walls"