The 3D Shadow Update

Objects can now cast shadows! Stay tuned for a long-form devlog about why I even bother (and how I even bother :))

In other news, there's some more small updates:

• The "leopard print" pattern that objects that are offset in the 4th dimension have now expands and contracts from the middle of the screen at all sizes!
• Objects that are behind you in the 4th dimension are no longer visible. Just like how objects that are behind you in the 3rd dimension are also not visible.
• Collision detection has been simplified due to poor performance. I'll make a better system once the rendering woks well enough.
• The depth buffer has been updated to make things appear more "correct." Previously the back sides of objects would randomly show on top. This can still happen, but it's less frequent.
• Due to the depth buffer change above, z-fighting is more of a problem than it used to be. Stay tuned for an eventual fix to that.