Align nixAC to spice2x folder structure

src/spice2x/acio2emu/node.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <vector>
+
+#include "acio2emu/packet.h"
+
+namespace acio2emu {
+    class Node {
+    public:
+        virtual ~Node() {}
+
+        virtual bool handle_packet(const Packet &in, std::vector<uint8_t> &out) = 0;
+    };
+}