[Bleeding] Added getting and setting drops to all appropriate events. Fixes BUKKIT-397 and fixes BUKKIT-1252

- Allows drops in creative mode by adding items to the getDrops() list
- Contents of containers are not reported
- Contents of storage minecarts are not reported

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

@@ -1,5 +1,6 @@
 package net.minecraft.server;
 
+import java.util.ArrayList; // CraftBukkit
 import java.util.Random;
 import org.bukkit.craftbukkit.event.CraftEventFactory;
 
@@ -54,19 +55,32 @@ public class BlockSnow extends Block {
     }
 
     public void a(World world, EntityHuman entityhuman, int i, int j, int k, int l) {
+        /* CraftBukkit start - This logic is exactly the same as in the superclass method, so defer it there
         int i1 = Item.SNOW_BALL.id;
         float f = 0.7F;
         double d0 = (double) (world.random.nextFloat() * f) + (double) (1.0F - f) * 0.5D;
         double d1 = (double) (world.random.nextFloat() * f) + (double) (1.0F - f) * 0.5D;
         double d2 = (double) (world.random.nextFloat() * f) + (double) (1.0F - f) * 0.5D;
         EntityItem entityitem = new EntityItem(world, (double) i + d0, (double) j + d1, (double) k + d2, new ItemStack(i1, 1, 0));
+        // This is done so that getDrops() in the BlockBreakEvent works properly.
 
         entityitem.pickupDelay = 10;
         world.addEntity(entityitem);
+        // */
+        super.doActualDrop(world, entityhuman, i, j, k, l);
+        // CraftBukkit end
         world.setTypeId(i, j, k, 0);
         entityhuman.a(StatisticList.C[this.id], 1);
     }
 
+    // CraftBukkit start - Calculate drops
+    public ArrayList<ItemStack> calculateDrops(World world, EntityHuman entityhuman, int i, int j, int k, int l) {
+        super.dropList = new ArrayList<ItemStack>();
+        this.a(world, i, j, k, new ItemStack(Item.SNOW_BALL.id, 1, 1));
+        return super.dropList;
+    }
+    // CraftBukkit end
+
     public int getDropType(int i, Random random, int j) {
         return Item.SNOW_BALL.id;
     }