hooklib/config.c: Add struct gfx_config

hooklib/config.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stddef.h>
+
+struct gfx_config {
+    bool enable;
+    bool windowed;
+    bool framed;
+};
+
+void gfx_config_load(struct gfx_config *cfg, const wchar_t *filename);