Custom dragon claws ko chance model

[Sacca-1]

This new model is a big improvement over the standard ko chance model, because the hitsplats from dragon claws land on two ticks, it now:

• Takes into account the different hitsplat patterns (which of the 4 accuracy rolls
  lands).
• Takes into account any HP healed in between the two ticks of damage.
• Combines the chance of dying from the damage of each tick into a single ko chance.

Now also correctly matches hitsplats for the dragon claws - granite maul combo, for which the hitsplats tend to appear as 2x claws -> 1x maul -> 2x claws.

[Sacca-1]

I've added custom handling of the dark bow special attack in this PR because it is similar with possible healing in between the hitsplats. This also now caps the dark bow's special attack at a max hit of 96, which was previously uncapped.