groundwork for interpreter platform

especially positioning makes the previous interpreter approach to
fragile (too far off the real thing)
Interpreter should be it’s own platform (still use the risc
instructions),
get a translator and use positions

lib/vool/vool_compiler.rb

@@ -13,9 +13,10 @@ module Vool
       statements = self.ruby_to_vool(source)
       statements.to_mom(nil)
     end
-    def self.ruby_to_binary(source)
+    def self.ruby_to_binary(source , platform = :arm)
       machine = Risc.machine.boot
       self.ruby_to_vool(source)
+      machine.translate(platform)
       machine.position_all
       machine.create_binary
     end