AFK status
 

It would be nice if an event was thrown when the player went AFK. This allows
for the behavior of mods to change based on AFK status without having to
parse the system messages (which requires localization).

Also two simple functions would be appreciated:

UnitIsAFK("unit") returns true or false, or nil for non-player units
UnitAFKMessage("unit") returns the AFK message or nil for non-player
units and non-AFK players.

These are the generic versions of the functions, so you can check the
AFK status of party or raid or guild member.

PlayerIsAfK() and PlayerAFKMessage() would work if we are only to be allowed
to get our own information.