TagCustom 2.0 is a major compatibility and quality update.

- Added support for legacy and modern Paper-compatible servers, from Minecraft 1.8.8 through modern versions.
- Added English and Spanish player messages.
- Added per-player language commands: /tag lang english and /tag lang spanish.
- Improved HEX color, gradient, rainbow, and legacy color formatting.
- Added automatic legacy color fallback for older Minecraft versions.
- Improved LuckPerms integration for per-tag permissions.
- Improved tag GUI visuals, lore, skull icons, and slot handling.
- Improved compatibility for materials and sounds across Minecraft versions.
- Added performance improvements with safer caching and cleaner save handling.
- Improved plugin architecture, configuration files, and error handling.
- Updated README, changelog, security policy, license notes, and publication text for open source release.