start a new ruby layer to do the to_vool conversion

the "normalization" is getting more and more complicated and is not tested
And it seems i really don't like working with the untyped ast

lib/ruby/array_statement.rb

@@ -0,0 +1,13 @@
+module Ruby
+  class ArrayStatement
+    attr_reader :values
+
+    def initialize( values )
+      @values = values
+    end
+
+    def length
+      @values.length
+    end
+  end
+end