fix some tiles dropping stuff that can't be dropped

src/main/java/storagecraft/block/BlockBase.java

@@ -83,7 +83,7 @@ public abstract class BlockBase extends Block
 	{
 		TileEntity tile = world.getTileEntity(x, y, z);
 
-		if (tile instanceof IInventory)
+		if (tile instanceof IInventory && tile instanceof TileBase && ((TileBase) tile).canDropInventory())
 		{
 			InventoryUtils.dropInventory(world, (IInventory) tile, x, y, z);
 		}

src/main/java/storagecraft/tile/TileBase.java

@@ -77,4 +77,9 @@ public abstract class TileBase extends TileEntity
 	{
 		direction = ForgeDirection.getOrientation(packet.func_148857_g().getInteger("Direction"));
 	}
+
+	public boolean canDropInventory()
+	{
+		return true;
+	}
 }

src/main/java/storagecraft/tile/TileDetector.java

@@ -290,4 +290,10 @@ public class TileDetector extends TileMachine implements IInventory, ISidedInven
 		buf.writeInt(amount);
 		buf.writeBoolean(providesPower);
 	}
+
+	@Override
+	public boolean canDropInventory()
+	{
+		return false;
+	}
 }

src/main/java/storagecraft/tile/TileExporter.java

@@ -232,4 +232,10 @@ public class TileExporter extends TileMachine implements IInventory, ISidedInven
 
 		buf.writeInt(compare);
 	}
+
+	@Override
+	public boolean canDropInventory()
+	{
+		return false;
+	}
 }

src/main/java/storagecraft/tile/TileImporter.java

@@ -280,4 +280,10 @@ public class TileImporter extends TileMachine implements IInventory, ISidedInven
 		buf.writeInt(compare);
 		buf.writeInt(mode);
 	}
+
+	@Override
+	public boolean canDropInventory()
+	{
+		return false;
+	}
 }