Fixed Ancient Fabric and Eternal Fabric being vulnerable to explosions.
I also noticed that a lot of DD blocks have unusual stats. I'm not sure
whether those stats were assigned intentionally or simply because of
copying and pasting code, but the values are certainly counterintuitive
when you consider some of the block materials.
Fixed a bug in BlockDimWall that would allow players to replace Ancient
Fabric by right clicking on it with a block in-hand, in the same way as
Fabric of Reality can be replaced. That would've defeated their purpose.
Fixed the bug in BlockDimWall that would cause Fabric of Reality to
replace itself when you right-clicked to place FoR against an FoR
surface. This happened because we considered FoR valid for replacing FoR
since it's a cube solid. Now we have an extra check to prevent that. It
was a waste of blocks to have them sort of eat each other up! Also
cleaned up some of the code in BlockDimWall.
