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/items/item_effects.asm

@@ -473,9 +473,7 @@ ItemUseBall:
 ; Mirror Move even though the only wild Pokémon that knows Transform is Ditto.
 	ld hl, wEnemyBattleStatus3
 	bit TRANSFORMED, [hl]
-	jr z, .notTransformed
-	ld a, DITTO
-	ld [wEnemyMonSpecies2], a
+	jr z, .notTransformed ; removed lines that cause above bug - PvK
 	jr .skip6
 
 .notTransformed
@@ -909,7 +907,10 @@ ItemUseMedicine:
 	ld de, wBattleMonStats
 	ld bc, NUM_STATS * 2
 	call CopyData ; copy party stats to in-battle stat data
-	predef DoubleOrHalveSelectedStats
+	xor a
+	ld [wCalculateWhoseStats], a
+	callfar CalculateModifiedStats
+	callfar ApplyBadgeStatBoosts
 	jp .doneHealing
 .healHP
 	inc hl ; hl = address of current HP