Support VSync callback

include/PSX/System/callbacks.hpp

@@ -0,0 +1,20 @@
+#pragma once
+#include "syscalls.hpp"
+
+namespace JabyEngine {
+    namespace Callback {
+        struct VSyncCallback {
+            using Function = void (*)();
+            
+            static Function callback;
+
+            static void install(Function function) {
+                VSyncCallback::callback = function;
+            }
+
+            static void uninstall() {
+                VSyncCallback::install(nullptr);
+            }
+        };
+    }
+}