Cached list of extras with a given flag
is_extra_flag_card_near() and is_extra_flag_near_tile() could be made to iterate only cached list of extras with the flag in question, instead of current iterating over all extras and filtering out all without the flag.
is_extra_flag_card_near() and is_extra_flag_near_tile() could be made to iterate only cached list of extras with the flag in question, instead of current iterating over all extras and filtering out all without the flag.