v1.3.0-prerelease1

Added features/changes:

• Sign support (Open AH shop or player listings with a sign)
• Added sounds for menu clicks and when item is sold
• Expired listings can now be automatically deleted
• Added permission for maximum listings (auctionhouse.limit.#)
• Added cooldown for listing items
• Listing expiration time can now be formatted
• Lang file fixes/changes
• Menu item ID's are no longer in lang files
• Other minor enhancements/bug fixes