Re-Adds the Sigh emote, Fixes #1301

(Hopefully) Fixes #1301
Re-adds the sigh emote, My guess is it was removed when emote code was cleaned up
(Note I think I may have added sigh to some carbon animals aswell, I don't see a need to remove it, Sighing is just an exhalation of air so animals CAN do it, if it is an issue though I will remove it)

Tested it personally and I can sigh all I wish.