removing builtin as a concept (wip)

the "old" way of generating compilers is now obsolete
we can use ruby code with mom macros to achieve the same
Three step wip
remove old builtin
fix tests (including adding necessary methods)
fixup and inclusion of builtin code to parfait

lib/mom/callable_compiler.rb

@@ -28,12 +28,6 @@ module Mom
       end
     end
 
-    # Only for init, as init has no return
-    def _reset_for_init
-      @mom_instructions = Label.new(source_name, source_name)
-      @current = @mom_instructions
-    end
-
     # add a constant (which get created during compilation and need to be linked)
     def add_constant(const)
       raise "Must be Parfait #{const}" unless const.is_a?(Parfait::Object)