Move lots of data tables into individual data/ files

(This is not expected to be their final location, but it makes them easier to relocate when necessary, and easier for users to edit until the whole project's file structure is finalized.)

data/wild/probabilities.asm

@@ -0,0 +1,15 @@
+GrassMonProbTable: ; 2a1cb
+	db 30,  $0 ; 30% chance
+	db 60,  $2 ; 30% chance
+	db 80,  $4 ; 20% chance
+	db 90,  $6 ; 10% chance
+	db 95,  $8 ;  5% chance
+	db 99,  $a ;  4% chance
+	db 100, $c ;  1% chance
+; 2a1d9
+
+WaterMonProbTable: ; 2a1d9
+	db 60,  $0 ; 60% chance
+	db 90,  $2 ; 30% chance
+	db 100, $4 ; 10% chance
+; 2a1df