CreateW Crates

## Changelog 1.1

- Fixed reward rolling: every player now receives an independently random reward.
- Split configuration into `config.json`, `crates.json`, and `rewards.json`.
- Added automatic migration from the previous single-file config.
- The purple frame and floating core are disabled by default.
- Added proper hologram background disabling.
- Added configurable hologram text scale and colors.
- Added configurable server announcements for crate openings and rewards.
- Added custom reward display names for previews and chat messages.
- Switching between `en` and `cs` no longer overwrites administrator customizations.
- Added reward chance validation and protection against binding crates to the wrong block.
- Improved configuration documentation.