Circle buffer and png cleaning.

test/core/TestDataStructures.cpp

@@ -0,0 +1,34 @@
+#include "CircleBuffer.h"
+
+#include <iostream>
+
+int main()
+{
+    CircleBuffer<unsigned> buffer(3);
+
+    for (auto item : {1, 2, 3})
+    {
+        std::cout << "Add item: " << item << std::endl;
+        buffer.addItem(item);
+    }
+
+    for (std::size_t idx=0; idx<3; idx++)
+    {
+        auto item = buffer.getItem(idx);
+        std::cout << "Got item: " << idx << " " << item << std::endl;
+    }
+
+    for (auto item : {4, 5})
+    {
+        std::cout << "Add item: " << item << std::endl;
+        buffer.addItem(item);
+    }
+
+    for (std::size_t idx=0; idx<3; idx++)
+    {
+        auto item = buffer.getItem(idx);
+        std::cout << "Got item: " << idx << " " << item << std::endl;
+    }
+
+    return 0;
+}