add basic edge shading

todo.md

@@ -2,11 +2,9 @@
 yoink implementation of mesh into meshes.zig so i could modify it to add ambient occlusion vars
 implement ambient occlusion either
  - via passing extra info to shader (can use 132 bits to indicate what tiles around the quad are obsuring light. need to pass as an extra variable)
-implement animated textures by either 
- - making literally everything animated 
- - somehow passing extra info to shader
+implement animations (smooth or minecraft like), random orientation/mirroring, metallicity (shine on edges)
+implement second layer of textures on top of first one for more details
 limit vertical camera rotations
-update libraries like raylib
 
 # future tasks
 implement chunk meshing cache to reduce delay on block placement