Fixed some issues with wounds, added saving

Fixed an issue with the wound data structure only supporting one wound
instead of an array.

Added timestamps to wounds, may be useful in the future.

Added an interface function for removing wounds.

Added two interface functions for getting and setting wound data in a
compact array format. This is used in hooked Save/Load callbacks to
store the wound data for a player.

Added and moved admin commands relating to damage.

Changed behaviour of medical items:
Bandages now stop bleeding and remove one wound.
Medkits stop bleeding, remove two wounds and give the player a
painkiller.
Doctor Bags stop bleeding, remove three wounds, give the player a
painkiller and morphine shot.

Fixed bleed rate in spectate UI.