CORE: NIN Spells/Abilities/Traits - Incorporate Feedback from teschnei

Mikage: Don't stack with DA/TA

Inhibit TP: Became a modifier that can be used by similar spells

Migawari: Refactored to have a generic method that is called affect the resist damage and resist magic damage mods are applied. This method can be reused for other similar spells.
When looking at similar spells, they each have a different non-cumulative threshold for applying, which means even though their reduction may be cumulative, it might not always stack. Therefore, these stayed as effect power and sub power respectively, which is processed by the generic function.