Added structure handling in engine as well.

include/Structures/Structure.hpp

@@ -0,0 +1,15 @@
+#ifndef DOUWCO_HIVEMIND_STRUCTURE_HPP
+#define DOUWCO_HIVEMIND_STRUCTURE_HPP
+
+#include <Screeps/Structure.hpp>
+
+namespace DouwcoHivemind
+{
+    class Structure
+    {
+    public:
+        virtual void loop(){}
+    };
+}
+
+#endif // DOUWCO_HIVEMIND_STRUCTURE_HPP