SteelSeries GameSense (Fabric, rewrite)

### Core Changes
* Full rewrite of the mod for Minecraft 1.21.11+ using Mojang official mappings.
  - Reimplemented SteelSeries GameSense integration from scratch.
  - Replaced blocking HTTP calls with async requests.
  - Fixed long-standing bug where tool display only updated after alt-tab / world reload, Now updates instantly on item switch (forced refresh workaround).
  - Fixed keyboard not updating immediately after regaining focus.
  - Fixed connection errors caused by dynamic GameSense port changes.
  - Fixed event spam causing unnecessary load.
  - Removed crashes caused by synchronous HTTP requests.

### Improvements
  - Cleaner and smaller codebase (removed unused legacy systems).
  - Robust handling of null states (player/world checks).

### Notes / Limitations
- SteelSeries GG only supports a predefined set of tools:
    - Mace, Spear, Trident, Shield, Flint and Steel, Bow, Crossbow, fishing rod, all Copper tools, are not defined by the SteelSeries plugin.
- Some items are mapped to closest equivalents for compatibility:
    - Mace will display an Iron Axe.
    - Spears will display Shovels.
    - Tridents will display a Diamond Sword.
    - Copper tools will display wooden tools.
    - Netherite tools will display stone tools.
    - Flint and Steel will display shears.

### Removed / Dropped
- Legacy mixins
- Time-of-day event (unused by SteelSeries GG)
- Broken/unused event handlers from older implementations

### Previous Versions (1.21.2 - 1.21.10)
These versions were based on community-maintained Fabric ports.
They are kept for compatibility/reference but are no longer maintained.