Shows a list and count of people in an instance. Helps with tracking if the instance is full or not.
Also adds the !instance chat command so people without the weakaura can check the number of people inside.
NOTE: Requires that the group leader has the weakaura installed for this command to work.
NOTE 2: There is currently an issue where if there is someone in the Dire maul area (not instance) but out of view range, they'll show as being in the instance.