Now trigger-like effects cannot use continuous_event.

included in field.h

fix unexpected MSG_RETRY when selecting cards with more than 64 candidates

https://www.lua.org/manual/5.4/manual.html

* add EFFECT_SET_BASE_ATTACK_FINAL

remove EFFECT_FLAG_REPEAT

* add get_base_atk_def(), get_atk_def()

* use get_atk_def()