Identify more labels, and use the jumptable macro when possible

engine/pokegear/pokegear.asm

@@ -432,16 +432,7 @@ Pokegear_FinishTilemap:
 	ret
 
 PokegearJumptable:
-	ld a, [wJumptableIndex]
-	ld e, a
-	ld d, 0
-	ld hl, .Jumptable
-	add hl, de
-	add hl, de
-	ld a, [hli]
-	ld h, [hl]
-	ld l, a
-	jp hl
+	jumptable .Jumptable, wJumptableIndex
 
 .Jumptable:
 ; entries correspond to POKEGEARSTATE_* constants