Extracting the mom instruction from builtin modules

Since they were embedded at first (easier copy/paste) they now got own files, like their brethren
also mini tests for each instruction , nice start

test/mom/builtin/test_init.rb

@@ -0,0 +1,18 @@
+require_relative "helper"
+
+module Mom
+  module Builtin
+    class TestObjectInitRisc < BootTest
+      def setup
+        super
+        @method = get_compiler(:__init__)
+      end
+      def test_compile
+        assert_equal Risc::MethodCompiler , @method.to_risc.class
+      end
+      def test_risc_length
+        assert_equal 48 , @method.to_risc.risc_instructions.length
+      end
+    end
+  end
+end