add half-working CXB support

cxbhook/cxb-dll.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <windows.h>
+#include <stdint.h>
+
+#include "cxbio/cxbio.h"
+
+struct cxb_dll {
+    uint16_t api_version;
+    HRESULT (*revio_init)(void);
+    void (*revio_poll)(uint16_t *opbtn);
+    void (*revio_get_coins)(long *coins);
+    void (*revio_set_coins)(int coins);
+    HRESULT (*led_init)(void);
+    void (*led_update)(int id, int color);
+};
+
+struct cxb_dll_config {
+    wchar_t path[MAX_PATH];
+};
+
+extern struct cxb_dll cxb_dll;
+
+HRESULT cxb_dll_init(const struct cxb_dll_config *cfg, HINSTANCE self);