fgo: fgohook finally added

Credits:
- Coburn
- domeori
- Mitsuhide
- OLEG
- rakisaionji

fgohook/fgo-dll.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <windows.h>
+
+#include "fgoio/fgoio.h"
+
+struct fgo_dll {
+    uint16_t api_version;
+    HRESULT (*init)(void);
+    HRESULT (*poll)(void);
+    void (*get_opbtns)(uint8_t *opbtn);
+    void (*get_gamebtns)(uint8_t *gamebtn);
+    void (*get_analogs)(int16_t *stick_x, int16_t *stick_y);
+};
+
+struct fgo_dll_config {
+    wchar_t path[MAX_PATH];
+};
+
+extern struct fgo_dll fgo_dll;
+
+HRESULT fgo_dll_init(const struct fgo_dll_config *cfg, HINSTANCE self);