FIXED:
- Fixed a small issue with virtual furnaces throwing errors
- Fixed an issue where input slots of virtual furnaces kept smelting even if the output slot was full, thus losing items.
- Fixed an issue with null NBT throwing invalid error, now it will pass

ADDED:
- Added support to retrieve UUIDs from NBT (NBT actually stores UUIDs in a split format, this joins it together)
- Added changers to bounds coord expression for adding/subtracting to/from coords rather than just setting them
- Added an option to modify NBT of an inventory slot

NOTES:
- Structure elements for 1.16+ still not working. These elements use an API called StructureBlockLib, which has still not updated for 1.16.x yet.