Noble Whitelist

This is a small hotfix, there is a major update planned to latter.

For PlaceholderAPI and MiniPlaceholders the identifier will be changed. (NobleWhitelist -> noblewhitelist)

This is to keep more consistency with other placeholders.

• Fixed an error when reloading database.
• Added new command for perm check of a player /nwl perm check <player> [min]
• Added an option to skip saving the uuid of a player.
• Added possibility to add incomplete entries to the local files.
• Invalid entries will be silently ignored.
• Removed an unused check with rare function.
• More information will be printed when an error occurs.
• Added new metrics information to be sent.