move to stock esp_http_server but keep it under control

- means 3 sockets are used (data + 2 for control)
- but LRU is activated (uses the 2 extra sockets to wake from select)
- backlog is just 1 (listen)
- only 3 sockets can be consumed before LRU activates
- for now, connections are kept-alive

components/tools/operator.cpp

@@ -1,3 +1,22 @@
-#include <stdlib.h> // for malloc and free
-void* operator new(unsigned int size) { return malloc(size); }
-void operator delete(void* ptr) { if (ptr) free(ptr); }
+#include <memory>
+#include <esp_heap_caps.h>
+
+void* operator new(std::size_t count) { 
+	return heap_caps_malloc(count, MALLOC_CAP_SPIRAM); 
+}
+
+void operator delete(void* ptr) noexcept { 
+	if (ptr) free(ptr); 
+}
+
+/*
+// C++17 only
+void* operator new (std::size_t count, std::align_val_t alignment) { 
+	return heap_caps_malloc(count, MALLOC_CAP_SPIRAM); 
+} 
+
+// C++17 only
+void operator delete(void* ptr, std::align_val_t alignment) noexcept { 
+	if (ptr) free(ptr); 
+}
+*/