Fix BlockCanBuildEvent returning null. Fixes BUKKIT-4972

A Block object is now passed in place of the previous id value, so the
obfuscated name for all subsequent arguments was shifted.  As such,
BlockCanBuildEvent was using the incorrect values for both the material
and the location of the event.

This is corrected by swapping the values into the correct order and
providing an id based upon the Block passed into the method.

src/main/java/net/minecraft/server/World.java

@@ -12,6 +12,7 @@ import java.util.concurrent.Callable;
 
 // CraftBukkit start
 import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.util.CraftMagicNumbers;
 import org.bukkit.craftbukkit.util.LongHashSet;
 import org.bukkit.craftbukkit.util.UnsafeList;
 import org.bukkit.generator.ChunkGenerator;
@@ -2330,7 +2331,7 @@ public abstract class World implements IBlockAccess {
         boolean defaultReturn = axisalignedbb != null && !this.a(axisalignedbb, entity) ? false : (block1.getMaterial() == Material.ORIENTABLE && block == Blocks.ANVIL ? true : block1.getMaterial().isReplaceable() && block.canPlace(this, i, j, k, l, itemstack));
 
         // CraftBukkit start
-        BlockCanBuildEvent event = new BlockCanBuildEvent(this.getWorld().getBlockAt(j, k, l), i, defaultReturn);
+        BlockCanBuildEvent event = new BlockCanBuildEvent(this.getWorld().getBlockAt(i, j, k), CraftMagicNumbers.getId(block), defaultReturn);
         this.getServer().getPluginManager().callEvent(event);
 
         return event.isBuildable();