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/primeape.asm

@@ -0,0 +1,10 @@
+; PrimeapePokedexEntry: ; 0x182e39
+	db "PIG MONKEY@" ; species name
+	dw 303, 710 ; height, weight
+
+	db   "It will beat up"
+	next "anyone who makes"
+	next "it mad, even if it"
+	page "has to chase them"
+	next "until the end of"
+	next "the world.@"