Remove Padded module

Parfait was depending on it, ie it created a dependency out of Parfait. But Parfiat needs to be self contained.
Moved 2 methods into parfait object, and resolved single call from text_writer to third.

lib/risc.rb

@@ -20,7 +20,6 @@ module Risc
   end
 end
 
-require_relative "risc/padding"
 require_relative "risc/position/position"
 require_relative "risc/platform"
 require_relative "risc/parfait_boot"