Single EFFECT_SET_BASE_ATTACK should reset single attack-assigning effects.

get_attack_target()
classified into 2 categories:
1.attacker=pcard
2.otherwise
The main differences are attack counts and EFFECT_ATTACK_ALL counts.

confirm_attack_target()
Now battle step replay rule will use this function instead.

data in root directory should have a higher priority

暂且先回了，编个相对正常的realease

load script from expansions/script/

revert part of b8f08756

http://www.db.yugioh-card.com/yugiohdb/faq_search.action?ope=5&fid=8149&keyword=&tag=-1
http://www.db.yugioh-card.com/yugiohdb/faq_search.action?ope=5&fid=9494&keyword=&tag=-1

Now choose attack target after replay is cancelable.

Now it will not consider EFFECT_CANNOT_BE_BATTLE_TARGET when checking current attack target before entering damage step.

ACTIVITY_ATTACK
The binary counter for 'cannot attack' oath effect.
The player may break this condition when:
1. atttack announce in battle step
2. attack made by card effect(Ex. Dice Roll Battle)

check at EVENT_BE_BATTLE_TARGET and begining of damage calculation.

http://www.db.yugioh-card.com/yugiohdb/faq_search.action?ope=5&fid=19155&keyword=&tag=-1
Now unexpected ending of damage step will raise EVENT_DAMAGE_STEP_END.

Now the players cannot enter EP if they have at least 1 attackable monster
with EFFECT_MUST_ATTACK.

check:
1. EFFECT_EXTRA_ATTACK
2. chain attack
3. EFFECT_EXTRA_ATTACK_MONSTER
4. effects with target limit(chain attack with a target,
EFFECT_ATTACK_ALL)

http://www.db.yugioh-card.com/yugiohdb/faq_search.action?ope=5&fid=14710&keyword=&tag=-1
Now the system uses field id instead of real field id.

http://www.db.yugioh-card.com/yugiohdb/faq_search.action?ope=5&fid=15829&keyword=&tag=-1
Now Duel.ChangeAttackTarget() cannot change the attack of monsters with
EFFECT_CANNOT_DIRECT_ATTACK into direct attack.