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Addon authors that use chat messages should check that their addons still work in 4.1

Authors will need to add calls to RegisterAddonMessagePrefix() in order to receive addon messages of a particular prefix, presumably during PLAYER_ENTERING_WORLD for the majority of addons. Note that this system errs on the side of sending too much; it is possible for addon messages to make it to the CHAT_MSG_ADDON handlers when no addon has registered it.

RegisterAddonMessagePrefix( )

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Returns a boolean if successful (could fail if it hits the client side limit of 512 prefixes).

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IsAddonMessagePrefixRegistered( )

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Returns a Boolean if the prefix has been registered.

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GetRegisteredAddonMessagePrefixes( )

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Returns a table (or you can pass in a table), that will be filled in with all prefixes that were registered.

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Prefixes are limited to 16 characters now, and they no longer take up a portion of the 256 character chat message limit. The server has a 64 prefix limit. If you exceed this limit your client will not filter any messages.

Also: SendAddonMessage() is now allowed for the OFFICER channel.

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