Add creative reservoir block

[Zorbatron]

What

Adds a creative reservoir for multiblocks

Implementation Details

Copied the code from the normal reservoir hatch :clueless:

Additional Information

Currently there are three issues:

1. After setting a different fluid, you can briefly see water as the set fluid, and then it stays the correct fluid.
2. It doesn't seem like multiblocks are notified when the fluid changes? If it's changed in the middle of a recipe, it stops (as it should), but nothing happens when you change it back. The multiblock only resumes operation when reformed or a circuit number is changed in a bus.
3. There's is no JEI drag thingy like with the creative tank, or locking an input hatch.

Video: https://imgur.com/a/HQiLdi7

Potential Compatibility Issues

None that I'm aware of.

[Zorbatron]

A little Todo list for myself:

• Change to be more like a nonuple input hatch instead of only one fluid.
• Add a ghost circuit slot (will need to wait on Rework Multiblock Abilities #2420)
• Be copyable with a data stick

[ALongStringOfNumbers]

Why have a creative reservoir hatch when we already have a creative quantum tank that you can use to fill hatches on multiblocks?

[Zorbatron]

Personally I see it as an easier way to test out multiblocks that consume fluid, but to be honest it doesn't serve too much of a purpose.