add race Cybers

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.