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/parfait/word.rb

@@ -183,7 +183,7 @@ module Parfait
     end
 
     def padded_length
-      Padding.padded( 4 * get_type().instance_length + char_length  )
+      Object.padded( 4 * get_type().instance_length + char_length  )
     end
 
     private