Cleanup

[BlitzOffline]

Cleaning up some stuff such as MenuItem

Currently I've only tested some basic functionalities:

• a few spigot materials
• head materials
• hand materials
• placeholder materials
• water bottle
• display name
• lore
• slot and slots
• click_commands, left_click_commands, shift_left_click_commands
• click_requirement, open_requirement, view_requirement, left_click_requirement
• message action
• potion effects
• banner patterns
• rgb colors

[iGabyTM]

Solid work 👏🏼