testing on the creative server

• fluid carts won't accept fluid from items

• fluid doesn't update until gui is opened

• somehow, fluid can exist/filter can be changed on a tank cart with a different filter
  

The update thing is duplicate of #1194, but other bugs are fresh.

All three bugs have been addressed in #1285.

For the fluid can exist part, it is intentional. However, after the filter is set, you can no longer input the old type of fluid into the cart.