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

Move some data into a pokemon/ subdirectory

data/pokemon/dex_entries/tyrogue.asm

@@ -0,0 +1,10 @@
+; TyroguePokedexEntry: ; 0x1d124b
+	db "SCUFFLE@" ; species name
+	dw 204, 460 ; height, weight
+
+	db   "To brush up on its"
+	next "fighting skills,"
+	next "it will challenge"
+	page "anyone. It has a"
+	next "very strong com-"
+	next "petitive spirit.@"