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/togetic.asm

@@ -0,0 +1,10 @@
+; TogeticPokedexEntry: ; 0x1cd402
+	db "HAPPINESS@" ; species name
+	dw 200, 70 ; height, weight
+
+	db   "Although it does"
+	next "not flap its wings"
+	next "very much, it can"
+	page "stay up in the air"
+	next "as it tags along"
+	next "after its trainer.@"