Chain stat modifiers in the proper order

10: Figure out a way to apply these directly to the stat later
...
6: Target Ability
5: User Ability
4: Target's Ally Abilities
3: User's Ally Abilities
2: Target's Item
1: User's Item

To be honest it's mostly for posterity's sake as well as to match the
soon-to-be-corrected base power modifiers. At the moment all stat
modifiers are either *1.5 or *2 which have the same result no matter
which order you chain them in. However a mod or ability/item in the
future could add a value that isn't as clean.