Port PureRGB AI

Short tests showed positive results. Revert if it fucks up anything.

PureRGB enhances Gen 1 AI in various ways, fixing notorious glitches and making it not do completely stupid things. I would use shin pokered's, but it may be too difficult for unfamiliar players, and has a bunch of outdated markers I'd have to spruce up.

Relevant changes:
- Burn effect calls have been replaced with Fire Blast's effect, replicating the burn spread use-case of Fire Blast
- Teleport references removed because pureRGB uses a unique version
- Any straggler references to effects not used in pureRGB
- Mist properly referred to as we only have one move that provides stat drop immunity.

Updated the sprite gallery too!!

ram/wram.asm

@@ -11,7 +11,8 @@ wChannel2:: channel_struct wChannel2
 wChannel3:: channel_struct wChannel3
 wChannel4:: channel_struct wChannel4
 
-	ds 1
+; for pureRGB AI jank
+wUnusedC000:: db
 
 wCurTrackDuty:: db
 wCurTrackVolumeEnvelope:: db
@@ -1211,11 +1212,11 @@ wBattleMon:: battle_struct wBattleMon
 
 wTrainerClass:: db
 
-	ds 1
-
 wTrainerPicPointer:: dw
 
-	ds 1
+; used by pureRGB AI
+wEnemyLastSelectedMoveDisable:: db
+wPlayerLastSelectedMove:: db
 
 UNION
 wTempMoveNameBuffer:: ds 14
@@ -1225,15 +1226,17 @@ NEXTU
 wLearnMoveMonName:: ds NAME_LENGTH
 ENDU
 
-	ds 2
+; For the pureRGB AI enhancements
+wAIMoveSpamAvoider:: db
+wAITargetMonStatus:: db
+wAITargetMonType1:: db
+wAITargetMonType2:: db
 
 ; money received after battle = base money × level of last enemy mon
 wTrainerBaseMoney:: dw ; BCD
 
 wMissableObjectCounter:: db
 
-	ds 1
-
 ; 13 bytes for the letters of the opposing trainer
 ; the name is terminated with $50 with possible
 ; unused trailing letters
@@ -1347,8 +1350,6 @@ wEnemyToxicCounter:: db
 ; low nibble: disable turns left
 wEnemyDisabledMove:: db
 
-	ds 1
-
 UNION
 ; the amount of damage accumulated by the player while biding
 wPlayerBideAccumulatedDamage:: dw