Split items/ and trainers/ into their data/ and engine/ components

Move some data into a pokemon/ subdirectory

data/pokemon/base_stats/articuno.asm

@@ -0,0 +1,22 @@
+	db ARTICUNO ; 144
+
+	db  90,  85, 100,  85,  95, 125
+	;   hp  atk  def  spd  sat  sdf
+
+	db ICE, FLYING
+	db 3 ; catch rate
+	db 215 ; base exp
+	db NO_ITEM ; item 1
+	db NO_ITEM ; item 2
+	db GENDERLESS ; gender
+	db 100 ; unknown
+	db 80 ; step cycles to hatch
+	db 5 ; unknown
+	INCBIN "gfx/pics/articuno/front.dimensions"
+	db 0, 0, 0, 0 ; padding
+	db SLOW ; growth rate
+	dn NO_EGGS, NO_EGGS ; egg groups
+
+	; tmhm
+	tmhm CURSE, ROAR, TOXIC, ROCK_SMASH, HIDDEN_POWER, SUNNY_DAY, SNORE, BLIZZARD, HYPER_BEAM, ICY_WIND, PROTECT, RAIN_DANCE, ENDURE, FRUSTRATION, RETURN, MUD_SLAP, DOUBLE_TEAM, SWAGGER, SLEEP_TALK, SANDSTORM, SWIFT, DETECT, REST, STEEL_WING, FLY, ICE_BEAM
+	; end