Merge branch 'fix_object_usage' into 'master'

fix some issues in object usage

1. 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.

2. Fix the issue that the 'activate object' talent defined in ActorObjectUse.lua use a meaningless global variable 'who'.

See merge request !857