WowAce

Adirelle:
    - Added a timeout when emptying a bag, so lag or a missing event doesn't lock the inventory forever.
    - Bag slots: use our own implementation that is far easier to manage.
    - Added a way to lock all item buttons, so nothing to bad happens when we automatically move items around (tidy or empty bag).
    - Fixed the bag emptying process.
    - Bag slots: one can right click on a bag to try to empty it.
    - Bag slots: display the number of items in each bag.
    - Small README update.
    - Set filter: postpone set scanning until we need it.
    - New items: track changes in stack sizes, not only the number of stacks.