Created ScoreType values for ability score modifiers.

- Added ScoreType.StrengthModifier through CharismaModifier.
- Added SCoreTypeHelper.AbilityScoreModifiers.
- Updated tests to check the modifiers are correct.
Added utility powers for Empath and Felinoid.

- Added a level 3 Kitty and alternate, along with tests.
- Added previously missing target for StandClear.