MailTo Again

Release v.1.8.5:
    - Fixed calls to GetSendMailItem() and GetInboxItem(), API was changed.

Release v.1.8.4:
    - Fixed function to return mail due to GetInboxItem() API change.
    - Fixed call to PlaySound("AuctionWindowOpen"), API changed in 7.3.
    - Update TOC to WoW 7.3.

Release v.1.8.3:
    - Fixed right-click on mailbox item, it generates an error with 7.0.

Release v.1.8.2:
    - Fixed call to GetSendMailItem() which lead to mail send failure.
    - Updated TOC to WoW 7.0.

Release v.1.8.1:
    - Fixed check on BoE recipes that produce BoP items, those were wrongly considered as BoP.
    - Added a check for Battle Pets since those don't have GameTooltip.

Release v.1.8.0:
    - Initial import for MailTo Next version 1.7.0.
    - Dropped OpenBackpack() supression, original functionality is good since 5.0 patch.
    - Updated TOC to WoW 6.2.