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

lib/mom/builtin/operator.rb

@@ -0,0 +1,28 @@
+module Mom
+  module Builtin
+    class Operator < ::Mom::Instruction
+      attr_reader :operator
+      def initialize(name , operator)
+        super(name)
+        @operator = operator
+      end
+
+      def to_risc(compiler)
+        builder = compiler.builder(compiler.source)
+        integer_tmp = builder.allocate_int
+        operator = @operator # make accessible in block
+        builder.build do
+          integer! << message[:receiver]
+          integer.reduce_int
+          integer_reg! << message[:arguments]
+          integer_reg << integer_reg[Parfait::NamedList.type_length + 0] #"other" is at index 0
+          integer_reg.reduce_int
+          integer.op operator , integer_reg
+          integer_tmp[Parfait::Integer.integer_index] << integer
+          message[:return_value] << integer_tmp
+        end
+        return compiler
+      end
+    end
+  end
+end