World Loader

• /worldloader or /wl - open gui or list all commands
• /wl list - list all available worlds
• /wl here - show the current world name (where am I)
• /wl load <name> - load the world
• /wl unload <name> - unload the world
• /wl delete <name> - delete the world and the world folder forever
• /wl create <name> [<normal/nether/end> <default/flat/void/generator_name> [seed]] - create a new world with specified settings and/or with custom generator
• /wl tp <name> [<x> <y> <z>] - teleport self to the world
• /wl tp <name> <player> [<x> <y> <z>] - teleport specified player to the world (opt. at x, y, z)
• /wl time <name> <value> - set time in the world
• /wl difficulty <name> <0/1/2/3> - change difficulty peaceful (0), easy (1), normal (2), hard (3)
• /wl pvp <name> <0/1> - enable (1) or disable (0) pvp in the world

• wl.cmd - permission to /worldloader (/wl)
• wl.list - to /wl list
• wl.here - to /wl here
• wl.create - to create a new world
• wl.load - to load a existing world
• wl.unload - to unload a existing world
• wl.delete - to delete a existing world forever
• wl.tp.self - to teleport self to the world
• wl.tp.others - to teleport other players to the world
• wl.time - to change the time
• wl.difficulty - to change difficulty
• wl.pvp - to enable/disable pvp mode

OP can do everything by default