fix some issues in object usage
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Arcane objects cannot be used by zigur followers anymore (Object.lua#canUseObject checks for this now). If you're antimagic, Swift Hand cannot use arcane object, and you cannot use Burning Star by pressing M and use the 'activate object' talent.
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Fix the issue that the 'activate object' talent defined in ActorObjectUse.lua use a meaningless global variable 'who'.