Rename all files in data/pokedex/entries/

Some people suggested this would be a good idea, and make management of
the files easier. I'm inclined to agree.

data/pokedex/entries/typhlosion.asm

@@ -0,0 +1,10 @@
+; TyphlosionPokedexEntry: ; 0x1ccba0
+	db "VOLCANO@" ; species name
+	dw 507, 1750 ; height, weight
+
+	db   "When heat from its"
+	next "body causes the"
+	next "air around it to"
+	page "shimmer, this is a"
+	next "sign that it is"
+	next "ready to battle.@"