Revise accuracy bonuses to have more impact and nicer breakpoints

On 1.5 only the staff accuracy bonus matters much, and the amount of accuracy to reach the cap is unlisted and varies from type to type.  This standardizes all accuracy bonuses to be capped at a 100 accuracy difference.  A side goal of this is making lower values of defense useful since it'll always at least reduce something.

Old:
Axe:  +10% crit at 50 accuracy
Sword:  +25% crit power at 62.5 accuracy
Mace:  +10% base power at 100 accuracy
Staff:  +200% proc damage at 80 accuracy

New:
Axe:  +25% crit at 100 accuracy
Sword:  +50% crit power at 100 accuracy
Mace:  +20% base power at 100 accuracy, now happen before armor
Staff:  +200% proc damage at 100 accuracy