Move history code to a separate header

Since no correction histories are ever used inside Movepick, and many
existing histories are closely integrated into search, it might be more
logical to separate them into their own header. PR based on #5650

closes https://github.com/official-stockfish/Stockfish/pull/5652

No functional change

src/search.cpp

@@ -34,6 +34,7 @@
 #include <utility>
 
 #include "evaluate.h"
+#include "history.h"
 #include "misc.h"
 #include "movegen.h"
 #include "movepick.h"