using compiler_for to create all building compilers

unify api, create defaults and especially pass the right types into the
typed method creation

lib/risc/builtin/space.rb

@@ -1,15 +1,17 @@
 require "ast/sexp"
+require_relative "compile_helper"
 
 module Risc
   module Builtin
     class Space
       module ClassMethods
         include AST::Sexp
+        include CompileHelper
 
         # main entry point, ie __init__ calls this
         # defined here as empty, to be redefined
         def main context
-          compiler = Risc::MethodCompiler.create_method(:Space , :main ).init_method
+          compiler = compiler_for(:Space , :main ,{args: :Integer})
           return compiler.method
         end