add Duel.GetTossedCoinCount and Duel.GetTossedDiceCount

Now the attack target can be null. (for c93599951)

1. Now cards sp_summoned by Duel.SpecialSummonStep() will not be counted
into cards on the filed in every script function.

2. If a card fails to return to field, it should be sent to grave by
REASON_RULE.

change priority of loading scripts

This reverts commit 7058e371.

Now a player can remove 2^16-1=65535 counters from each card.

http://www.db.yugioh-card.com/yugiohdb/faq_search.action?ope=5&fid=14083&keyword=&tag=-1
http://www.db.yugioh-card.com/yugiohdb/faq_search.action?ope=5&fid=12625&keyword=&tag=-1
Now negate/disable activation effects can be activated after effects
cannot be negated/disabled, and nothing will happen in resolution.

The condition inside ocgcore is moved to check_chain_negate(),
check_chain_disable().