Replace old ore(coal, iron, diamond) textures with procedurally generated ones.

Also remove ugly grass(I don't want this in the release. It can be easily readded once graphics and textures exist.

Author: IntegratedQuantum

cubyz-client/addons/cubyz/blocks/grass_vegetation

@@ -4,6 +4,7 @@
 
 import org.joml.Vector3f;
 
+import io.cubyz.CubyzLogger;
 import io.cubyz.blocks.Block;
 import io.cubyz.items.Item;
 import io.cubyz.items.ItemStack;
@@ -58,7 +59,10 @@ public ItemEntityManager(Surface surface, NormalChunk chunk, byte[] data, Palett
 		int length = Bits.getInt(data, index);
 		index += 4;
 		// Check if the length is right:
-		if(data.length-index != length*4*9) throw new IllegalStateException("Save file is corrupted.");
+		if(data.length-index != length*4*9) {
+			CubyzLogger.logger.warning("Save file is corrupted. Skipping item entites for chunk "+chunk.getWorldX()+" "+chunk.getWorldZ());
+			length = 0;
+		}
 		// Init variables:
 		capacity = (length+63) & ~63;
 		posxyz = new float[3 * capacity];