fix aiob when opening chisel in some slots (#51)

src/main/java/team/chisel/inventory/ContainerChisel.java

@@ -152,13 +152,13 @@ public class ContainerChisel extends Container {
     }
 
     public void onChiselSlotChanged() {
-        ItemStack stack = playerInventory.mainInventory[chiselSlot];
+        ItemStack stack = playerInventory.getStackInSlot(chiselSlot);
         if (stack == null || !stack.isItemEqual(chisel)) finished = true;
 
         if (finished) return;
 
         General.setChiselTarget(chisel, inventory.getStackInSpecialSlot());
 
-        playerInventory.mainInventory[chiselSlot] = chisel;
+        playerInventory.setInventorySlotContents(chiselSlot, chisel);
     }
 }

src/main/java/team/chisel/inventory/SlotChiselSelection.java

@@ -66,7 +66,7 @@ public class SlotChiselSelection extends Slot {
             .onChisel(player.worldObj, container.chisel, General.getVariation(crafted))) {
             container.chisel.damageItem(1, player);
             if (container.chisel.stackSize <= 0) {
-                player.inventory.mainInventory[player.inventory.currentItem] = null;
+                player.setCurrentItemOrArmor(0, null);
             }
         }
 

src/main/java/team/chisel/item/chisel/ChiselMode.java

@@ -121,7 +121,7 @@ public enum ChiselMode implements IChiselMode {
                 player.getCurrentEquippedItem()
                     .damageItem(1, player);
                 if (player.getCurrentEquippedItem().stackSize <= 0) {
-                    player.inventory.mainInventory[player.inventory.currentItem] = null;
+                    player.setCurrentItemOrArmor(0, null);
                     breakChisel = true;
                 }
             }