renaming methods args and frame

to arguments_type and frame_type, because that is what they are
In honour of setup bug, where the types of those types were loaded,
instead of just them types

lib/vool/statements/local_assignment.rb

@@ -8,7 +8,7 @@ module Vool
     end
 
     def to_mom( method )
-      if method.arguments.variable_index(@name)
+      if method.arguments_type.variable_index(@name)
         type = :arguments
       else
         type = :frame

lib/vool/statements/variables.rb

@@ -11,7 +11,7 @@ module Vool
   class LocalVariable < Expression
     include Named
     def slot_definition(method)
-      if method.arguments.variable_index(@name)
+      if method.arguments_type.variable_index(@name)
         type = :arguments
       else
         type = :frame