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/scizor.asm

@@ -0,0 +1,10 @@
+; ScizorPokedexEntry: ; 0x1d0821
+	db "SCISSORS@" ; species name
+	dw 511, 2600 ; height, weight
+
+	db   "This #MON's"
+	next "pincers, which"
+	next "contain steel, can"
+	page "crush any hard"
+	next "object it gets a"
+	next "hold of into bits.@"