libraries: Drop std::iterator template usage.

Define iterator traits manually instead of using deprecated std:iterator template.

See https://www.fluentcpp.com/2018/05/08/std-iterator-deprecated/

This fixes a C++17 deprecation warning and C++20 error on GCC 14.

libraries/gpu/src/gpu/Buffer.h

@@ -198,9 +198,14 @@ public:
 
     //Template iterator with random access on the buffer sysmem
     template<typename T>
-    class Iterator : public std::iterator<std::random_access_iterator_tag, T, Index, T*, T&>
+    class Iterator
     {
     public:
+        using iterator_category = std::random_access_iterator_tag;
+        using value_type = T;
+        using difference_type = Index;
+        using pointer = T*;
+        using reference = T&;
 
         Iterator(T* ptr = NULL, int stride = sizeof(T)): _ptr(ptr), _stride(stride) { }
         Iterator(const Iterator<T>& iterator) = default;

libraries/shared/src/RingBufferHistory.h

@@ -103,8 +103,11 @@ private:
     std::vector<T> _buffer;
 
 public:
-    class Iterator : public std::iterator < std::random_access_iterator_tag, T > {
+    class Iterator {
     public:
+        using iterator_category = std::random_access_iterator_tag;
+        using value_type = T;
+
         Iterator(T* bufferFirst, T* bufferLast, T* newestAt, T* at)
             : _bufferFirst(bufferFirst),
             _bufferLast(bufferLast),