remove virtual main instruction

on a quest to remove all virtual instructions

lib/virtual/instructions/virtual_main.rb

@@ -1,23 +0,0 @@
-module Virtual
-
-  # This starts the Virtual machine machine at the given function.
-
-  # The implementation is most likely a jump/branch , but since we have the extra layer
-  # we make good use of it, ie give things descriptive names (what they do, not how)
-
-  class VirtualMain < Instruction
-    include Positioned
-
-    def initialize method
-      @method = method
-    end
-    attr_reader :method
-    def word_length
-      4
-    end
-
-    def to_s
-      "#{self.class.name}( method: #{method.name})"
-    end
-  end
-end