Version 2.5!
Spigot Page: https://www.spigotmc.org/resources/chat-manager.28562/

This simple plugin will allow you to clear your chat, the servers chat, and lock the servers chat!
This plugin allows players to clear their own chat, and for staff to clear the entire chat or lock it!
Want me to add something? Suggest it!

/cc - Will clear the ENTIRE servers chat
/cp - Will clear only YOUR chat
/cchelp - Type this if you forget the commands
/cclock - lock the chat
/ccunlock - unlock the chat
/ccperms - look at all the plugins permissions
/ccreload - reloads the config

chat.public - Permission for the /cc command
chat.private - Permission for the /pc command
chat.help - Permission for the /cchelp command
chat.lock - Permission for the /cclock command
chat.unlock - Permission for the /ccunlock command
chat.perm - Permission for the /ccperm command
chat.talk - chat while chat is locked
chat.reload - Permission for the /ccreload command