Don't include heavy STL headers like <algorithm> in header files

This provides a considerable compilation time reduction and most
of these were just using std::copy/fill which can be replaced by
memcpy/memset, as all of their uses were applied to POD types

examples/traceroute.cpp

@@ -35,6 +35,7 @@
 #define _GLIBCXX_USE_NANOSLEEP
 
 #include <iostream>
+#include <iomanip>
 #include <chrono>
 #include <thread>
 #include <cstdint>