Revive Me!

FIXED

- No more duplicated items: dying could leave two loot chests holding the same loot.
- Opening a loot chest no longer duplicates the armor you were wearing.
- A loot chest can no longer be looted twice.
- No more wall of messages when you die: after dying you were knocked down again in a
  loop, over and over.
- No more half broken states, like being knocked but still able to walk around, or
  staying stuck in place after being revived.
- You can no longer revive yourself, and a knocked player is no longer asked to revive
  someone else.
- You now stay on the ground while knocked: the pose no longer breaks when a mob pushes
  you, in water or after a small fall.
- You no longer rejoin the world knocked down after being revived.
- /reviveme:reset now works with any targets (@a, @s, @p).
- /reviveme:revive now works with any targets (@a, @s, @p).

CHANGED

- The Medikit has been rebuilt: it stops on its own once you are fully healed, and it is
  used up only when it really breaks.
- If the loot chest can't be created for any reason, your loot drops on the ground
  instead of being lost.