Support the cauldron interaction of the rats mod. Test if it is working already and what is missing.

Cauldron interaction is basically supported. Following mechanism need work:

• Geting milk out of a milk cauldron does not work. (that is ok) ✔
• Putting milk into a cauldron works but a milk bucket remains > endless milk
  • Added a PR for Rats to support container changing fluid handlers ⏱

merged