Add Mob Head drop

[tier940]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @tier940, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces comprehensive integration with the "Just Enough Resources" (JER) mod, aiming to provide players with enhanced in-game information about item drops. A new gameplay feature has been added, enabling certain hostile mobs to drop their skulls upon player defeat. The implementation of these skull drops is handled through modifications to the game's loot tables, which also ensures their visibility and accurate representation within the JER interface. The PR also includes necessary build system updates and internal mod registration to support the new integration.

Highlights

• Just Enough Resources (JER) Integration: The project now fully integrates the "Just Enough Resources" mod, allowing players to view detailed information about item drops and resources.
• New Mob Skull Drop Mechanic: Introduced a feature where Creepers, Skeletons, Zombies, and Endermen (when EnderIO is present) have a 2.5% chance to drop their respective skulls when killed by a player.
• Loot Table Modifications for JER Display: Entity loot tables for relevant mobs have been updated to include the new skull drops, ensuring they are correctly displayed within the JER interface.
• Build System and Mod Registration: Updated Gradle dependencies to include JER and added a dedicated debug flag, along with registering JER in the internal Mods utility and as a core module.

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[gemini-code-assist]

Code Review

このプルリクエストは、Just Enough Resources (JER) との連携機能を追加するものです。全体的に良い変更ですが、いくつかの改善点があります。
主な懸念点は、GTEEventHandlers と JERModule の両方でモブの頭蓋骨ドロップ処理が実装されており、機能が重複している点です。これにより、意図しない二重ドロップの可能性があります。LootTableLoadEvent を使用する JERModule の実装がよりモダンで互換性が高いため、GTEEventHandlers の LivingDropsEvent に基づく実装は削除することを推奨します。
また、JERModule.java 内のコードの重複を減らすためのリファクタリングと、dependencies.gradle の依存関係定義をより保守しやすくするための提案も行いました。
これらの点を修正することで、コードの品質と保守性が向上します。

[gemini-code-assist]

Code Review

このプルリクエストは、特定のMobが倒された際に頭をドロップする機能を追加するものです。変更は主に GTEEventHandlers.java に集中しており、Loot Tableを操作してドロップを追加しています。コードは機能的に正しいように見えますが、保守性と可読性を向上させるためにいくつかのリファクタリングが可能です。特に、コードの重複を減らし、マジックナンバーを定数に置き換えることを提案します。詳細は各コメントを参照してください。