Creative Utils

• Adds support for 1.21.x and not just 1.21.1

• Adds ‘/CreativeUtils SetAir’ and ‘/air’. To use them, make a selection with the WorldEdit select tool and then run one of these commands to make all blocks in the selection disappear.

• Makes some changes to the ‘/CreativeUtils SetupNewWorld’. It now disables mob spawning and sets the difficulty to peaceful.(Aimed at superflat worlds because slimes in superflat worlds just not be a feature.)