Optimized internal string handling to improve function speed.

Adds SetActiveEffectMagnitude() & SetActiveEffectDuration() for ActiveMagicEffects. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ (magnitude edits currently only work for spells that apply their magnitude every second [not just at beginning/end of effect])