Align nixAC to spice2x folder structure

src/spice2x/acio/kfca/kfca.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "../module.h"
+
+namespace acio {
+
+    extern uint8_t KFCA_VOL_SOUND;
+    extern uint8_t KFCA_VOL_HEADPHONE;
+    extern uint8_t KFCA_VOL_EXTERNAL;
+    extern uint8_t KFCA_VOL_WOOFER;
+
+    class KFCAModule : public ACIOModule {
+    public:
+        KFCAModule(HMODULE module, HookMode hookMode);
+
+        virtual void attach() override;
+    };
+}