wip: move gfx to gfxhook, some borderless window stuff

gfxhook/gfx.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <windows.h>
+
+#include <stdbool.h>
+
+struct gfx_config {
+    bool enable;
+    bool windowed;
+    bool framed;
+    int monitor;
+};
+
+void gfx_hook_init(const struct gfx_config *cfg, HINSTANCE self);