Release 1.21.8-4.0.0

• New major release - more details for developers can be found on wiki
• New file format support
• Reworked validations
• Added possibility to easily mark config values as dependencies on some other values or mods
• Added simple way to add custom validators
• Fixed missing errors/warnings in GUI when there were multiple issues
• Fixed issue with array elements being accessed from the user-saved value instead of the server value
• Fixed decimal number ranges not being formatted properly in GUI tooltip description
• Fixed possible game crash source