[Patch][8056] Remove some more hardcoded CMSG_CLEAR_COOLDOWN opcodes

[XTZGZoReX]

http://paste2.org/p/276156

Does what the title says. I'm not sure if the update_only parameter is *really* needed, but I think .clear() looks a bit nicer than removing each cooldown in the for() inside RemoveAllSpellCooldowns().

[VladimirMangos]

With some changes in [8056]. Thank you