Elementary Stats 0.4.0

New HUD Options
- Added a compact gold-and-charcoal HUD displaying your RPG level and exact XP progress.
- The compact HUD appears in the bottom-right corner by default.
- The original HUD remains available through the STANDARD format.
- Added configurable screen corners, margins, width and scale.
- Added a level-only display by disabling `show_experience`.
- All HUD customization is handled through `config/elementarystats-client.toml`.

Performance Improvements
- Optimized HUD rendering using a shared background texture and cached text and layout.
- Reduced redundant client/server synchronization while preserving attribute updates and transaction confirmations.
- Lecterns reuse previously received attribute information.
- Inventory cooldown indicators reuse server-pushed information, reducing unnecessary requests.

Compatibility and Validation
- Existing RPG saves, attribute balance and public APIs are preserved.
- Verified XP synchronization, HUD layouts, ranking, lecterns, redistribution scrolls, dimension changes and respawning.