[MochaMilkie]

Information

This PR closes #6638.

Details

Proposed feature:
Adding a native, lightweight anti-spam system directly into EssentialsXChat. It should include basic moderation mechanics to keep chat clean without needing third-party plugins.

The core features should include:

Chat Cooldown: A configurable delay (in seconds) between messages with a bypass permission (essentials.chat.bypass.cooldown).
Duplicate Filter: Blocking identical or highly similar repetitive messages from the same player.
Caps Lock Filter: Automatically converting text to lowercase if a message contains too many capital letters (e.g., >70% CAPS).
Automated Actions: Configurable responses when spam is detected (block message, warn player, or run a command).

Environments tested:

OS: Ubuntu 26.04

Java version:

• Most recent Paper version (26.2, git-Paper-74)
• CraftBukkit/Spigot/Paper 1.12.2
• CraftBukkit 1.8.8

Demonstration: