Testing font and color font

include/PSX/GPU/Primitives/linked_elements.hpp

@@ -34,11 +34,16 @@ namespace JabyEngine {
             }
 
             template<typename T>
-            const T& concat(const T& obj) {
+            T& concat(T& obj) {
                 Link::set_adr(&obj);
                 return obj;
             }
 
+            template<typename T>
+            const T& concat(const T& obj) {
+                return concat(const_cast<T&>(obj));
+            }
+
             constexpr void terminate() {
                 this->value |= TerminationValue;
             }