nightcore

Fixed error of previous 2.7.4 build

• Migrate plugin name, commands, language, database and userdata settings to the engine.yml config file.
• Added LangUIButton class with better localization of GUI editor buttons.
• Make NightSound class compact for config files.
• Added NightSound support for the sound tag of lang messages. This allows to use volume and pitch values and custom RP sounds.
• Added 'Locale' config option for Number Formatter.
• Added 'TimeZone' config option.
• New TimeFormats class with different time format options.
• Fixed NightTask#stop never worked properly.
• Fixed possible CommandMap errors.