Import C++11 branch

Import C++11 branch from:

https://github.com/mcostalba/Stockfish/tree/c++11

The version imported is teh last one as of today:
https://github.com/mcostalba/Stockfish/commit/6670e93e50a7a4e739ac2ac8b6026ffa3a12150a

Branch is fully equivalent with master but syzygy
tablebases that are missing (but will be added with
next commit).

bench: 8080602

src/material.h

@@ -40,7 +40,7 @@ struct Entry {
 
   Score imbalance() const { return make_score(value, value); }
   Phase game_phase() const { return gamePhase; }
-  bool specialized_eval_exists() const { return evaluationFunction != NULL; }
+  bool specialized_eval_exists() const { return evaluationFunction != nullptr; }
   Value evaluate(const Position& pos) const { return (*evaluationFunction)(pos); }
 
   // scale_factor takes a position and a color as input and returns a scale factor