DeathPlus Update 1.0.3

Small but important polish pass for public release.

• Updated DeathPlus to build cleanly against Spigot API for better Spigot/Paper compatibility.
• Supports Spigot/Paper 1.21 through current 26.1.x releases.
• Fixed several Duckshot death message edge cases with delayed kills, explosives, fire, poison, and stale attacker data.
• Prevented messages from incorrectly using whatever item the attacker is currently holding after the real weapon was already thrown, placed, or fired.
• Improved compatibility for Duckshot guns, grenades, claymores, mines, mortars, airstrikes, NPC usage, and related delayed damage.
• Kept the Death+ branding, prefix, hover text, configs, and existing behavior intact.

This update is mostly stability, compatibility, and message accuracy.