Prepare CD Callback handler

include/PSX/System/callbacks.hpp

@@ -3,9 +3,9 @@
 
 namespace JabyEngine {
     namespace Callback {
-        using Function = void (*)();
-
-        struct VSyncCallback {
+        struct [[deprecated("Currently not supported")]] VSyncCallback {
+            using Function = void (*)();
+            
             static Function callback;
 
             static void install(Function function) {
@@ -16,17 +16,5 @@ namespace JabyEngine {
                 VSyncCallback::install(nullptr);
             }
         };
-
-        struct DataReadyCallback {
-            static Function callback;
-
-            static void install(Function function) {
-                DataReadyCallback::callback = function;
-            }
-
-            static void uninstall() {
-                DataReadyCallback::install(nullptr);
-            }
-        };
     }
 }