[Action] implement lockable state flags #8877
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State flags are added/removed via spell attribute parsing during action_t::init(). This means that anything set during construction can be overriden, and as such users must remember to explictly override init() and make changes there. This allows state flags to be 'locked' in place during spell attribute parsing in action_t::init() such that any flag set/unset during action construction will not be changed. Any changes to state flags made while unlocked will always be applied.
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State flags are added/removed via spell attribute parsing during action_t::init(). This means that anything set during construction can be overriden, and as such users must remember to explictly override init() and make changes there.
This allows state flags to be 'locked' in place during spell attribute parsing in action_t::init() such that any flag set/unset during action construction will not be changed. Any changes to state flags made while unlocked will always be applied.