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/padding.rb

@@ -1,22 +0,0 @@
-# Helper functions to pad memory.
-#
-# Meory is always in lines, chunks of 8 words / 32 bytes
-module Padding
-
-  # objects only come in lengths of multiple of 8 words / 32 bytes
-  # and there is a "hidden" 1 word that is used for debug/check memory corruption
-  def self.padded( len )
-    a = 32 * (1 + ((len + 3)/32).floor )
-    #puts "#{a} for #{len}"
-    a
-  end
-
-  def self.padded_words( words )
-    padded(words*4) # 4 == word length, a constant waiting for a home
-  end
-
-  def self.padding_for( length )
-    pad = padded(length) - length  # for header, type
-    pad
-  end
-end

lib/risc/parfait_adapter.rb

@@ -99,7 +99,7 @@ class Symbol
     l
   end
   def padded_length
-    Padding.padded( to_s.length + 4)
+    Parfait::Object.padded( to_s.length + 4)
   end
 
 end

lib/risc/text_writer.rb

@@ -216,7 +216,7 @@ module Risc
     # pad_after is always in bytes and pads (writes 0's) up to the next 8 word boundary
     def pad_after( length )
       before = stream_position
-      pad = Padding.padding_for(length)
+      pad =  Parfait::Object.padded(length) - length  # for header, type
       pad.times do
         @stream.write_unsigned_int_8(0)
       end