HasVampireFed

Returns 1 if the actor it is called on has a vampire fed flag and it is set to true (this happens in the code when a vampire feed package finishes).

NOTE: this only works for the player, who is the only one with a vampire fed flag. All other actors will return 0.

HasVampireFed also clears the flag, so if you call it twice in a row it should return 1 the first time and 0 the second.