let boot_functions return the compilers

methods are still added, but this is a good step to removing the risc/cpu level from the methods

lib/risc/builtin/space.rb

@@ -10,7 +10,7 @@ module Risc
         def main(context)
           compiler = compiler_for(:Space , :main ,{args: :Integer})
           compiler.add_mom( Mom::ReturnSequence.new)
-          return compiler.method
+          return compiler
         end
 
       end