Better Traders [Datapack]

-Added a new trade slot to the wandering trader; they will now offer 7 trades instead of 6!

        -A bunch of internal changes were made to make this work

-Added a trade for goat horns

        -Both regular and screaming goat horns are available, though regular horns are more common

-Added trades for axolotl and tadpole buckets

-Added a trade for mangrove propagules

-Removed trade for tropical fish bucket

-Tweaked the final, “special” trade slot to have a stronger focus on rare or useful items

                -The gunpowder and packed ice trades have been moved to the regular trade pool

                -The scute trade is now a part of this pool

-Added some files to be used internally

-Tweaks to keep things working as expected

-Fixed an issue where items from the final trade slot would not stack properly