moving know_object out of the base class

object is only common to constant and object slots (which should be unified)
On the way to making the array recursive

test/slot_machine/helper.rb

@@ -1 +1,9 @@
 require_relative '../helper'
+
+module SlotMachine
+  class InstructionMock < Instruction
+    def initialize
+      super("mocking")
+    end
+  end
+end

test/slot_machine/instruction/helper.rb

@@ -1,11 +1,6 @@
 require_relative '../helper'
 
 module SlotMachine
-  class InstructionMock < Instruction
-    def initialize
-      super("mocking")
-    end
-  end
 
   # Most SlotMachineInstructionTests test the risc instructions of the slot instruction
   # quite carefully, ie every instruction, every register.