Enable Reservoirs from Thermal Expansion

[NotMyWing]

I figured this would be the best way to introduce Reservoirs without having to come up with new recipes.

This PR enables Reservoirs and adds two-way conversion recipes while removing default recipes and leaving dye recipes intact.

Any Portable Tank can be converted 1:1 to Reservoir of its tier and vice versa (including creative). Craft a Reservoir if you need one, then craft it back into a Portable Tank when you no longer need it.

Both Portable Tanks and Reservoirs retain contents, display names and enchantments during the conversion.

[Exaxxion]

This is a neat approach but I think we're fine just using the vanilla reservoir recipes. The basic recipe components are already somewhat gregged and a large bucket is not really going to affect game balance.

I know you used 50 for the NBT conversion to cleanly match up, but I think that's excessive for the base reservoir size. I wouldn't mind bumping it up to 16 buckets base size though; I don't get why TE uses 10 and 50 for reservoirs and portable tanks, respectively.