Fix a bunch of single player battle engine bugs

went through a bunch of the tutorials here;
https://github.com/pret/pokered/wiki/Bugs-and-Glitches#blaine-uses-super-potion-even-when-his-pok%C3%A9mon-arent-below-10-health

Overall:
- Blaine is no longer addicted to Super Potions
- CoolTrainerF no longer switches a lot
- Transformed Pokemon aren't presumed to be Dittos (very important given Animon)
- Status curing items don't remove modifiers anymore
- Learning new moves plays the sound in the correct bank

engine/battle/trainer_ai.asm

@@ -345,7 +345,7 @@ CooltrainerFAI:
 	; The intended 25% chance to consider switching will not apply.
 	; Uncomment the line below to fix this.
 	cp 25 percent + 1
-	; ret nc
+	ret nc ; fixes the bug
 	ld a, 10
 	call AICheckIfHPBelowFraction
 	jp c, AIUseHyperPotion
@@ -387,6 +387,9 @@ KogaAI:
 BlaineAI:
 	cp 25 percent + 1
 	ret nc
+	ld a, 10
+	call AICheckIfHPBelowFraction
+	ret nc ; this fixes the super potion thing - PvK
 	jp AIUseSuperPotion
 
 SabrinaAI: