Fuji (Essentials)

WARNING:

If you are using a version before v1.5.9, you should read the changelog of v1.5.9.

• feature: add /fiji about command. (fuji module)
• feature: use vanilla way to hide nametag if the player is sneaking. (nametag module)
• feature: locales for keyword in language file.
• refactor: rename config module into fuji module.
• fix: can't fetch online skin if the uuid exists in usercache.json is wrong. (head module)